Psychological capital, work engagement and organisational commitment amongst call centre employees in South Africa

The call centre environment is one of the fastest-growing segments in the service sector, both in South Africa and internationally (Swart, 2006). Employees in the South African call centre sector have increased from 50 000 in 2005 to 180 000 in 2010 and it is predicted that approximately 100 000 new jobs will be created in the country by 2015 (Thomas, 2010). Holman (2003) has conducted much research on the demanding and stressful nature of call centre work. Call centre work is characterised by a sensory overload, rapid technological, product and service changes, work pressure and high workloads (Swart, 2006). The consequences of this may include stress, burnout, anxiety, absenteeism and performance problems (Lombard, 2009). In response to the above, call centre employees need to develop positive psychological resources as they have an impact on positive work-related attitudes and behaviours (Avey, Wernsing & Luthans, 2008). A review of the literature indicates that little has been done with regard to exploring the role of state-like characteristics and other personal resources in managing organisational demands or facilitating employee performance in call centres (Lombard, 2009; Zapf, Isic, Bechtoldt & Blau, 2003). In this regard, positive psychological resource capacities, such as psychological capital, have been shown to have an impact on desired work-related outcomes such as improved attitudes to work engagement and behaviours of organisational commitment in various work contexts (Youssef & Luthans, 2007). In our review of the literature, the authors have not found any study investigating psychological capital and its relationship with work engagement and organisational commitment in a call centre. Therefore, the current study investigates the relationship between Psychological capital (PsyCap), work engagement and organisational commitment and determines whether PsyCap and work engagement predict organisational commitment. Orientation: The development of psychological capital amongst call centre employees could have an impact on positive work-related attitudes and behaviour; such as work engagement and organisational commitment.


Introduction
The call centre environment is one of the fastest-growing segments in the service sector, both in South Africa and internationally (Swart, 2006). Employees in the South African call centre sector have increased from 50 000 in 2005 to 180 000 in 2010 and it is predicted that approximately 100 000 new jobs will be created in the country by 2015 (Thomas, 2010). Holman (2003) has conducted much research on the demanding and stressful nature of call centre work. Call centre work is characterised by a sensory overload, rapid technological, product and service changes, work pressure and high workloads (Swart, 2006). The consequences of this may include stress, burnout, anxiety, absenteeism and performance problems (Lombard, 2009). In response to the above, call centre employees need to develop positive psychological resources as they have an impact on positive work-related attitudes and behaviours (Avey, Wernsing & Luthans, 2008). A review of the literature indicates that little has been done with regard to exploring the role of state-like characteristics and other personal resources in managing organisational demands or facilitating employee performance in call centres (Lombard, 2009;Zapf, Isic, Bechtoldt & Blau, 2003). In this regard, positive psychological resource capacities, such as psychological capital, have been shown to have an impact on desired work-related outcomes such as improved attitudes to work engagement and behaviours of organisational commitment in various work contexts (Youssef & Luthans, 2007). In our review of the literature, the authors have not found any study investigating psychological capital and its relationship with work engagement and organisational commitment in a call centre. Therefore, the current study investigates the relationship between Psychological capital (PsyCap), work engagement and organisational commitment and determines whether PsyCap and work engagement predict organisational commitment.
Orientation: The development of psychological capital amongst call centre employees could have an impact on positive work-related attitudes and behaviour; such as work engagement and organisational commitment.

Psychological capital
Psychological capital is a core construct of POB (Luthans & Youssef, 2004). It is proposed as an important composite construct that can assist in addressing human capital issues in organisations. PsyCap consists of four psychological resource capacities, namely, hope, optimism, resilience and self-efficacy . Psychological capital places emphasis on the positive nature and strengths of employees and the role this has on fuelling employees' growth and performance (Luthans, Avolio, Walumbwa & Li, 2005). The psychological dimensions of PsyCap have been linked to overall workplace attitudes and performance (Luthans, Youssef & Avolio, 2007) such as higher job satisfaction, work happiness and citizenship Youssef & Luthans, 2007). Youssef and Luthans (2007) maintain that the relationship between PsyCap and work engagement and organisational commitment have been supported empirically in various organisational contexts.
The PsyCap constructs of hope, optimism, resilience and self-efficacy will be presented in brief below. Snyder (2002) explains hope as a multidimensional construct that consists of an individual's 'willpower' and 'waypower'. Willpower is an individual's agency or determination to achieve goals and 'waypower' is one's ability to devise alternative pathways and contingency plans in order to achieve a goal in the face of obstacles (Snyder, Irving & Anderson, 1991). Hope enables individuals to be motivated to attain success with the task at hand by looking for the best pathway . The components of hope thus complement each other (Weick & Quinn, 1999).

Hope
Hope has made a significant contribution to positive PsyCap and has demonstrated importance in the workplace (Duggleby, Cooper & Penz, 2009;Luthans & Jensen, 2002). For instance, researchers discovered that hope predicted job performance beyond cognitive ability and self-efficacy (Peterson, Walumbwa, Byron & Myrowitz, 2009). Moreover, Youssef and Luthans (2007) found that it had a positive effect on employee satisfaction, organisational commitment and work happiness. Hope also protects an individual's perceptions of vulnerability, uncontrollability and unpredictability (Snyder, 2002). Weick and Quinn (1999) thus believe that sustaining employees' hope is necessary for employee wellbeing.

Optimism
Optimism is more closely associated with positive psychology than the other constructs . It is regarded as being a realistic, flexible and dynamic construct that can be learned and developed (Peterson, 2000). Optimism is defined by persistence and pervasiveness -two key dimensions of how people explain events (Carver & Scheier, 2002). People with an optimistic outlook see setbacks as challenges and opportunities that can eventually lead to success (Luthans et al., 2005). These individuals persevere in the face of obstacles (Stajkovic & Luthans, 1998). In the work context, an optimistic employee is better able to assess external, temporary and situational circumstances (Youssef & Luthans, 2007).
In a South African study, Rothmann and Essenko (2007) found that dispositional optimism had a direct effect on exhaustion and cynicism amongst support staff in a higher education institution. Other research has shown that optimism correlated with employee engagement and employee performance (Arakawa & Greenberg, 2007;Medlin & Faulk, 2011). It is the authors' view that optimism forms a vital part of a call centre employee's resource capacities as their optimistic approach to stressful and challenging situations could potentially have a positive impact on the achievement of work-related goals. Rutter (1987) defined resilience as people's ability to manipulate their environment successfully in order to protect them from the negative consequences of adverse events. Luthans (2002b) extended this definition to include people's ability to 'bounce back' from adversity. In this regard, resilient people move on in life after having had a stressful experience or event such as personal adversity, conflict and/ or failure. Therefore, resilience highlights the strength of the individual and his or her coping resources to successfully resolve and/or manage testing situations (Baumgardner & Crothers, 2010).

Resilience
Research has attempted to link resilience positively with workplace performance (Luthans et al., 2007). Research indicates that when employees experience negative events in the workplace, individuals with high PsyCap are more likely to adapt positively and bounce back from those events, thus preventing the escalation and development of intentions to quit (Luthans, Avey, Avolio, Norman & Combs, 2006). Philippe, Lecours and Beaulieu-Pelletier (2008) found that resilience has been associated with positive emotions, especially when an individual is experiencing a taxing event. Research has further indicated possible links between resilience, commitment and work engagement, as well as a positive link between resilience and work happiness (Luthans, Avolio, Avey & Norman, 2007;Youssef & Luthans, 2007). Resilience has also been linked to more effective coping mechanisms and behaviours that facilitate growth and development. In this regard, Youssef and Luthans (2008) propose that this may lead to higher overall commitment to the organisation, even though employees may experience their current situation and job requirements as unfavourable. Stajkovic and Luthans (1998) define self-efficacy as an individual's conviction regarding their ability to mobilise the motivation, cognitive resources and courses of action necessary to accomplish a specific task within a given context. An individual's perception and interpretation of events will influence and determine how they will address difficult challenges, as well as how they will experience of stress symptoms (Bandura, 2000). Those with high levels of efficacy will perceive challenges as surmountable, given sufficient competencies and effort (Avey, Luthans & Jensen, 2009).

Self-efficacy
Self-efficacy is a high-order construct of PsyCap (Luthans et al., 2007). This positive psychological resource capacity of confidence, which is a state, can be developed. It is described as an enthusiastic and independent concept, being linked closely with work-related performance .
Self-efficacy has also been shown to be related to the socialisation and retention of new employees (Bauer, Bodner, Erdogan, Truxillo & Tucker, 2007); as well as being related to organisational commitment and turnover intentions of existing staff (Harris & Cameron, 2005). In a South African study, Rothmann (2003) found that positive psychological constructs such as self-efficacy could have a mediating effect on occupational stress, burnout and work engagement. There are no studies in South African call centres on self-efficacy and its relation to work-related outcomes. Bakker, Demerouti and Schaufeli (2003) define work engagement as a positive, fulfilling, work-related state of mind that is characterised by vigour, dedication and absorption. Vigour is characterised by high levels of energy and mental resilience whilst working; dedication refers to being strongly involved in one's work and experiencing a sense of importance, enthusiasm, inspiration, pride and challenge; and absorption is characterised by being fully concentrated on and happily engrossed in one's work, whereby time passes quickly and one experiences difficulties with regard to detaching oneself from work (Schaufeli, Salanova, González-Romá & Bakker, 2002). Kahn (1990) outlined how engaged employees express physical, cognitive and emotional components when applying themselves in their work role. Employees need to have physical, emotional and psychological resources so as to complete their work and to identify with it. Maslach and Leiter (1997) conceptualised engagement and burnout as being opposite poles of a continuum of work-related wellbeing. However, Schaufeli and Bakker (2004) believe that these two concepts cannot have a perfect negative correlation.

Organisational commitment
Organisational commitment refers to the nature of the employee's attachment to their organisation (Shahnawaz & Jafri, 2009) and to the employee's identification with and involvement in a particular organisation (Mowday, Porter & Steers, 1982). Allen and Meyer (1990) proposed a three-component model of organisational commitment: affective, continuance and normative commitment. Affective commitment refers to the employee's emotional attachment to, identification with and involvement in the organisation. Continuance commitment refers to commitment based on the benefits of staying with the organisation versus the costs that are associated with leaving the organisation. Normative commitment refers to an employee's feeling of obligation to remain with the organisation. Much research has focused on the affective component of organisational commitment (Field & Buitendach, 2011). The affective component has the strongest and most consistent relationship with desirable workplace outcomes (Arzu Wasti, 2003).

Relationship between constructs
Research has shown that psychological resource capacities do have a positive impact on work-related outcomes such as work engagement and organisational commitment (Youssef & Luthans, 2007). The different dimensions of PsyCap have been shown to have a positive correlation with organisational commitment (Luthans, Norman, Avolio & Avey, 2008). Empirical research has found that organisational commitment is correlated with hope, optimism, resilience and self-efficacy (Sinha, Talwar & Rajpal, 2002;Youssef & Luthans, 2007). Buys and Rothmann (2010) reported a positive correlation between organisational commitment and work engagement, concluding that engaged employees had better social functioning and affective commitment. Researchers have also presented evidence that work engagement and organisational commitment have a complementary relationship (Demerouti et al., 2001;Macey & Schneider, 2008).
However, Janse van Rensburg (2010) asserts that there is a lack of published studies on the strengths and psychological capacities of call centre employees. More specifically, to the knowledge of the researchers within the South African context, no research has addressed the relationship between the PsyCap, work engagement and organisational commitment of call centre employees.
The purpose of the present study was to address this gap in the research by identifying the relationships that may exist between PsyCap, work engagement and organisational commitment amongst South African call centre employees. It also aimed to establish whether PsyCap and work engagement have an impact on the organisational commitment of call centre employees. The development of the state-like construct of PsyCap can be facilitated through human resources interventions such as training and development . These interventions could potentially facilitate the skills and coping strategies required in the call centre environment. Furthermore, the selection of call centre employees could also potentially include PsyCap profiles in order to ensure sustainability in the call centre environment.

Research approach
The research design used in the present study was a crosssectional design, whereby a sample was drawn from a specified population (Huysamen, 1994;Shaughnessy & Zechmeister, 2000). According to Shaughnessy and Zechmeister (2000) this type of research design is ideally suited to descriptive and predictive functions and is thus well suited to achieve the aims and objectives of the present study.

Research participants
A nonprobability convenience sample was used in the study. Shaughnessy and Zechmeister (2000) explain that convenience sampling involves selecting respondents primarily on the basis of their availability and willingness to respond. This was the preferred sampling technique as it had the practical benefits of being less time-consuming and more efficient (Goodwin, 2004). Employees who made themselves available in their own time were selected to participate in the study (Babbie & Mouton, 2001). The research participants were call centre employees from one call centre situated in KwaZulu-Natal, South Africa. Table 1 contains the participants' biographical data. The sample comprised more women (70.8%) than men (29.2%), which is understandable as there are generally more women than men working in call centres. Many (n = 50) of the participants were 25-35 years old. There were differences in terms of marital status and academic qualifications. Most participants had been working in the call centre for less than five years.

Characteristics of participants:
Of the participants, 19.8% had previous call centre experience, 11.3% had previous work experience in the customer service industry and 7.5% had previous experience in the administrative, health insurance or finance sectors.

Measuring instruments
The data collection consisted of a biographical data sheet and three scales. The biographical information included the participants' gender, age group, marital status, years working within the organisation (tenure), highest qualification attained and work experience.
The Psychological Capital Questionnaire (PCQ) (Luthans et al., 2007) measures PsyCap and comprises four subscales, namely, hope, optimism, resilience and self-efficacy. The PCQ is a self-report questionnaire and has 24 items. Each subscale consists of six items. All the responses for the PCQ are anchored on a six-point Likert scale with the response options: 1 = strongly disagree, 2 = disagree, 3 = somewhat disagree, 4 = somewhat agree, 5 = agree, 6 = strongly agree. Psychological capital includes statements such as: 'At the present time, I am energetically pursuing my goals' (hope); 'I am optimistic about what will happen to me in the future as it pertains to work' (optimism); 'I usually manage difficulties one way or another at work' (resilience); and 'I feel confident helping to set targets/goals in my work area' (self-efficacy). The resulting score represents an individual's level of PsyCap. Each of the four subscales of PsyCap was drawn from established scales that had been published previously and had been tested and used in recent workplace studies (Avey, Luthans & Youssef, 2010a). The Cronbach alphas reported in their study were as follows: hope 0.87; optimism 0.78; resilience 0.72; and self-efficacy 0.87. Acceptable reliability coefficients have been reported in South African samples for the four dimensions with the alpha coefficients ranging from 0.67 to 0.83 (Herbert, 2011).
The Utrecht Work Engagement Scale (UWES) (Schaufeli et al., 2002) was used to measure work engagement. The UWES is a self-report questionnaire and has 17 items. The UWES comprises three subscales, namely, vigour (6 items), dedication (5 items) and absorption (6 items The UWES is scored on a seven-point Likert scale, varying from 0 = never to 6 = every day. The UWES has been found to have acceptable reliability coefficients that have been reported both internationally and in South Africa. Storm and Rothmann (2003) obtained alpha coefficients for internal consistency and reliability for the three subscales of between 0.78 and 0.89 in a South African context.
The Organisational Commitment Questionnaire (OCQ) (Allen & Meyer, 1990) has three subscales that measure different types of organisational commitment, namely, affective commitment, cognitive commitment and normative commitment. The OCQ consists of 18 items and is scored on a five-point Likert type scale ranging from 1 = strongly disagree to 5 = strongly agree. Acceptable reliability coefficients of above 0.80 have been reported for every one of these subscales (Suliman & Iles, 2000). In a South African study, Jackson, Rothmann and van de Vijver (2006)

Statistical analysis
The Statistical Package for the Social Sciences program (version 21.0) was used to carry out the statistical analysis (IBM SPSS Inc., 2012). Descriptive statistics (means, medians, standard deviations, skewness and kurtosis) were used to describe the data. Confirmatory factor analysis was undertaken in order to determine the factor structure of the PCQ, UWES and the OCQ. Cronbach alpha coefficients (α) were used to assess the internal consistency or reliability of the measuring instruments. A cut-off point of p <0.05 was set for the statistical significance of the results. Effect sizes (Cohen, 1988) were used to decide on the practical significance of the findings. Pearson product-moment correlation coefficients were used to specify the relationship between PsyCap, work engagement and organisational commitment. The statistical significance levels used in this study were p ≤ 0.05 and p ≤ 0.01 respectively. Pearson product-moment correlation coefficients were then also used to specify the relationships between the variables. A cut-off point of 0.30 (medium effect; Cohen, 1988) was set for the practical significance of correlation coefficients. Cohen's (1988) benchmark values are used as a qualitative judgement to determine whether the practical significance is 'small', 'medium' or 'large'. The guidelines given by Cohen (1988) were 0.1: small effect; 0.3: medium effect; and 0.5: large effect. Practical significance for the study was set at 0.30. A medium effect size ranges from 0.30 to 0.49 and a large effect size ranges from 0.50 and above (Steyn, 2011).
Hierarchical regression analysis (Field, 2005) was conducted to determine whether psychological capital and work engagement held predictive value for the organisational commitment. Table 2 provides an overview of the descriptive statistics minimum, maximum, mean, standard deviation, skewness and kurtosis, as well as the Cronbach alpha coefficients of the PCQ, the UWES and the OCQ. The statistical ranges of -2 to 2 for skewness and -7 to 7 for kurtosis are acceptable; therefore this data set has acceptable normality and lends itself to further analysis. All three questionnaires (PCQ, UWES and OCQ) had acceptable reliability with Cronbach's alpha coefficients being greater than 0.9 for the first two and greater than 0.7 for the OCQ. The reliability coefficient for PCQ was 0.91 and for the constructs of hope, optimism, resilience and self-efficacy, 0.76, 0.72, 0.90 and 0.87, respectively. The UWES reliability coefficient was 0.95 and the constructs of vigour, dedication and absorption had internal reliabilities of 0.90, 0.86 and 0.85, respectively. The internal reliability of the OCQ was 0.79 and the internal reliabilities of the constructs of affective, continuance and normative commitment were 0.74, 0.65 and 0.74, respectively.

Descriptive statistics and Cronbach alpha coefficients
Confirmatory factor analyses of the three questionnaires indicated that four factors could be extracted for the PCQ, explaining 62.16% of the total variance; three factors could be extracted for the UWES, explaining 56% of the total variance; and three factors could be extracted for the OCQ, explaining 53.23% of the total variance.

Pearson product-moment correlation coefficients
Pearson product-moment correlation coefficients were used in order to examine the strength of the relationships between the variables of the present study. Table 3 reports the correlations between the constructs of psychological capital (PsyCap measure), work engagement (UWES measure) and organisational commitment (OCQ measure). Table 3 shows that a positive statistically-and practicallysignificant relationship was found between PsyCap (hope, optimism, resilience and self-efficacy) and work engagement (vigour, dedication and absorption), (p ≤ 0.01; r = 0.73). Also, a positive statistically-and practically-significant relationship was found between PsyCap and organisational commitment (affective, continuance and normative commitment), (p ≤ 0.01; r = 0.35). Furthermore, a statistically-and practicallysignificant relationship was found between work engagement (total score) and organisational commitment (total score) (p ≤ 0.01; r = 0.63).

The relationship between the Utrecht Work Engagement Scale and Organisational Commitment Questionnaire
A further inspection of Table 3 shows that positive statisticallyand practically-significant relationships were found between organisational commitment (total score) and vigour, dedication and absorption (p ≤ 0.01; r = 0.61, 0.64 and 0.52, respectively). Statistically-positive and practically-significant relationships were found between affective commitment and vigour, dedication and absorption (p ≤ 0.01; r = 0.64, 0.65 and 0.54, respectively), as well as between continuance commitment and dedication and absorption (p ≤ 0.01; r = 0.69 and 0.41, respectively). There was also a statistically-significant relationship between continuance commitment and vigour (p ≤ 0.05, r = 0.27). Positive statistically-and practicallysignificant relationships were found between normative commitment and vigour, dedication and absorption (p ≤ 0.01; r = 0.62, 0.57 and 0.52, respectively).
The findings reported above support the hypotheses of the present study: firstly, that PsyCap is related positively to work engagement (vigour, dedication and absorption); secondly, that PsyCap is related positively to organisational commitment (affective and normative commitment); and thirdly, that work engagement is related positively to organisational commitment (affective and normative commitment).  with PsyCap as the third step of the regression analysis produced a statistical model F = (20.871) = 4.568; p ≥ 0.000), accounting for approximately 41% of the variance. In the final model, work engagement (β = 0.590; p ≥ 0.000) statistically predicted organisational commitment and PsyCap (β = 0.067) did not.

Discussion
The purpose of the research was to determine the relationship between PsyCap, work engagement and organisational commitment amongst call centre employees; and also to determine whether PsyCap and work engagement hold predictive value for the organisational commitment of call centre employees.
The majority of participants in this research were women -a relatively young group with the majority younger than 35 years of age with less than 5 years' experience in the call centre. It is interesting to mention that 19.8% of the respondents had worked previously in a call centre, possibly suggesting that employees tend to stay in call centre work. Any conclusions fall beyond the scope of this research and further research in this regard is necessary.

Reliability and validity of instruments
The study found high levels of internal consistency reliabilities for the measuring instruments (and their subscales) used in this study. Cronbach alpha coefficients (α) were used as a reliability estimate and all, except continuous organisational commitment, were found to be acceptable according to the guideline of α ≥ 0.70 (Nunnally & Bernstein, 1994). Based on research (Heymans, 2002), it was decided to include continuance commitment, although the Cronbach alpha was below that of 0.70.

Confirmatory factor analysis
Confirmatory factor analysis of the PCQ found that a fourfactor model best fit the data. Conceptual and empirical analysis supports the four constructs of PsyCap as a core construct that is made up of four identified positive resources (hope, optimism, resilience and self-efficacy). These four constructs have thus been found to meet the operational definition and inclusion criteria of psychological capital (Avey et al., 2010a;Luthans, Avey & Petera (2008); . A recent South African study confirmed a four-factor model of PCQ (Herbert, 2011). Analysis of the UWES found a three-factor model best suited the data. Most international studies have confirmed a three-factor model comprising vigour, dedication and absorption (Schaufeli et al., 2002). Studies from South Africa have also confirmed a threefactor model of the UWES (Barkhuizen & Rothmann, 2006;Rothmann & Jordaan, 2006). Confirmatory factor analysis conducted on the OCQ found that a three-factor model best fit the data. The findings confirm the three-factor model as proposed by Allen and Meyer (1990). International studies have confirmed a three-factor model consisting of affective, normative and continuance commitment (Shahnawaz & Jafri, 2009). South African studies have also confirmed a three-factor model of organisational commitment (Ferreira, Basson & Coetzee, 2010;Lumley, 2010).

Inferential statistics
Pearson correlation coefficients were done and the results suggested that higher levels of PsyCap are associated with higher levels of work engagement and organisational commitment. Psychological capital as a personal resource can be implemented to enhance attitudinal outcomes such as work engagement and organisational commitment. This is supported by Halbesleben (2010) who found in a meta-analysis that personal resources (e.g. optimism and self-efficacy) are related strongly to work engagement. Furthermore, higher levels of work engagement are associated with higher levels of organisational commitment. Research studies conducted internationally have found that PsyCap is related positively to organisational commitment (Larson & Luthans, 2006;). However, a stronger relationship was found between PsyCap and work engagement than between PsyCap and organisational commitment. The current findings support those of Shahnawaz and Jafri (2009) who found that PsyCap and organisational commitment were not related very strongly.
A study by Avey et al. (2008), with employees from a broad cross-section of organisations and jobs, found that PsyCap was related positively to their positive emotions which were, in turn, related to their attitudes of engagement. These findings can be interpreted within Fredrickson's (2003) broadenand-build framework, where the experience of positive emotions can propel people toward optimal individual and organisational functioning. Furthermore, the present findings indicated that work engagement and organisational commitment were related positively to each other. Schaufeli and Bakker (2004) showed that the experience of engagement is described as being a positive work-related experience and state of mind. Positive experiences and emotions are likely to result in positive work outcomes. The authors further note that engaged employees are likely to have a greater attachment to their organisation and a lower tendency to leave their organisation. The present study findings have been supported by international research studies that found a positive relationship between work engagement and organisational commitment (Saks, 2006;Sonnentag, 2003).
Psychological capital as a core construct has been found to be related to several workplace outcomes . The present study's findings support research that has shown that the overall core construct of PsyCap relates better to the outcomes of work engagement and organisational commitment than to the individual constructs (hope, optimism, resilience and self-efficacy) that make it up (Luthans et al., 2005). Psychological strengths can create tendencies that are favourable to work engagement (Strümpfer, 1990). Work engagement as a 'positive, fulfilling, work-related state of mind that is characterised by vigour, dedication and absorption' has a positive relationship with individual attitudes and behaviour (Harter, Schmidt & Hayes, 2002;Schaufeli et al., 2002, p. 74). The present study's findings support the theoretical and empirical findings that PsyCap and desirable workplace attitudes and behaviours have a positive relationship (Avey et al., 2010a).
The findings of this study further indicated that the PsyCap subdimensions and work engagement subdimensions had a positive relationship. This is supported by studies that have established that personal resources such as self-efficacy and optimism predicted work engagement (Xanthopoulou, Bakker, Heuven, Demerouti & Schaufeli, 2008). Roux (2010) found self-efficacy to be related positively to work engagement of employees in a South African organisation.
In addition, a positive relationship between PsyCap and organisational commitment subdimensions was found.
There have been a number of studies that have tested the relationship between PsyCap and various employee attitudes (Avey, Reichard, Luthans & Mhatre, 2011). In a study by McColl-Kennedy and Anderson (2005), there was evidence of a dependency link between optimism and commitment. Saks (2006) found that post-training self-efficacy mediated the relationship between training and job satisfaction, turnover intentions and organisational commitment.
The current findings showed a significant relationship between work engagement and organisational commitment. Employees with high organisational commitment are more likely to be enthusiastic about their work (engagement). Organisational commitment is an employee's identification with the organisation's goals and values and being attached affectively to the organisation (Mowday, Steers & Porter, 1979). Work engagement is described by Macey and Schneider (2008, p. 12) as: 'positive affect associated with the job and the work setting, connoting or explicitly indicating feelings of persistence, vigour, energy, dedication, absorption, enthusiasm, alertness and pride'. Research has also shown that work engagement is an antecedent of organisational commitment. People who are deeply engaged in their work tend to be more committed to their organisations (Jackson et al., 2006;Saks, 2006). The findings in this study are supported by various research studies. Researchers, both internationally and nationally, have found a positive relationship between work engagement and organisational commitment (Field & Buitendach, 2011;Rothmann & Jordaan, 2006).
An interesting finding in this study was that the PsyCap construct of optimism displays a significant positive relationship with work engagement, as well as with the subdimensions of vigour, dedication and absorption. Furthermore, the findings of the current study have shown a statistically-significant as well as a practically-significant positive relationship between the PsyCap construct of optimism and organisational commitment and the subdimensions of normative commitment and affective commitment. Research studies have shown that optimism is related positively to employee engagement and employee performance (Medlin & Faulk, 2011;Tombaugh, 2005). In addition, Bressler (2010) found that optimism had a positive relationship with affective commitment. A review of the literature supports the present study finding that optimism is overall more closely associated with positive psychology than the other constructs .
A review of the literature suggests that optimism has a positive relationship with a positive, fulfilling work-related state of mind (work engagement) (Bakker et al., 2003). Furthermore, optimism has a positive relationship with an employee's belief and acceptance of the organisation's goals and values. This indicates a willingness by an employee to focus on helping the organisation achieve its goals and a desire to maintain organisational membership (affective commitment). Optimism has also been found to have a positive relationship with the moral belief or obligation that it is the right thing to remain with the organisation (normative commitment) (Shahnawaz & Jafri, 2009).
Given its value in employee well-being, optimism must be encouraged and developed in intervention programmes within organisations (Peterson et al., 2009). In call centres, such interventions can enhance the resource capacities of employees. Having an optimistic outlook for call centre employees is critical with regard to the quality of their interaction with customers (Deery & Kinnie, 2002). Ashkanasy and Daus (2002) have shown that individuals 'catch' on to the feelings of others and that positive expressions of emotion by call centre employees can create a favourable impression in a customer's mind.

Predictive value of psychological capital and work engagement
The second objective of the present study was to determine whether PsyCap and work engagement were predictive of organisational commitment. Hierarchical regression analysis was conducted with organisational commitment as the dependent variable and PsyCap and work engagement as the independent variables. Work engagement was found to be the best predictor of organisational commitment. This finding is supported by previous studies that have found work engagement to be predictive of organisational commitment (Schaufeli & Bakker, 2004;Sonnentag, 2003). Schaufeli and Bakker (2004) reported that engaged employees are likely to have a greater attachment to their organisation and a lower tendency to leave their organisation. The psychological resources that are generated by an employee's positive emotions have a relationship with, and contribute to, desired work-related outcomes (Youssef & Luthans, 2007). The present study's finding that work engagement is the only statistically-significant predictor of organisational commitment needs to be explored in future research studies. The reason for PsyCap not being predictive of organisational commitment needs to be further investigated.
To summarise, this study builds more evidence supporting a cognitive mediation theory (Weiss & Cropanzano, 1996) of employees' emotions in the workplace. It brings to the understanding that employees' psychological beliefs, expectancies and appraisals (i.e., hope, optimism, resilience and self-efficacy) may be seen as a potential source of positive emotions and subsequent employees' attitudes and behaviours such as work engagement and organisational commitment.
Previous research also indicated that PsyCap as a personal resource can be developed. Organisations, such as call centres, can introduce programmes to develop PsyCap in order to bring about more favourable attitude outcomes such as work engagement and organisational commitment.

Limitations of the study
The cross-sectional survey method cannot determine causality amongst variables. A further limitation of this study is the use of self-reported questionnaires. These are used frequently as a preferred method of data collection in the social sciences (Babbie & Mouton, 2001). Self-report data can give rise to response biases which could affect the reliability and validity of the data. Social desirability is one of the response biases that influences the results of studies that use self-report questionnaires (Goodwin, 2004). A further limitation of the study could be attributed to the small sample size of 106 and the use of a nonprobability sampling method, more specifically a convenience sampling method. These limit the generalisation of the results to a larger population of call centre employees.

Recommendations for the organisation
The findings in this study indicated that positive relationships exist between PsyCap, work engagement and organisational commitment. To facilitate efficiency and positive well-being amongst employees, it is recommended that call centres invest in the development of PsyCap (Avey et al., 2010a). A study by Luthans et al. (2006) found that human resource interventions aimed at developing the state-like construct of PsyCap can be facilitated by means of training sessions. The development of organisational interventions may increase call centre employees' personal resources which will, in turn, increase their PsyCap levels and facilitate increased employee wellness, work engagement and organisational commitment . The development of PsyCap and positive employee attitudes and behaviours are expected to contribute to positive work-related outcomes (Donaldson & Ko, 2010). Furthermore, the complementary nature of work engagement and organisational commitment is conducive to long-term performance and sustainable humanbased organisational competitive advantage (Youssef & Luthans, 2007).
More specifically, optimism was found to have the strongest relationship with work engagement and organisational commitment in this study. This finding is useful in informing an emphasis on optimism in training interventions. Optimism, as a personal resource, can be developed to have favourable attitudinal outcomes such as work engagement and organisational commitment.
Avey, Nimnicht and Pigeon (2010b) maintain that measurement of PsyCap may inform an organisation of the vitality, psychological health and anticipated future performance of the organisation. Also, the use of a PsyCap measure may be of benefit in selection batteries for organisations. The selection and retention of employees who have a propensity to be higher in psychological capital may have a positive impact on work-related outcomes (Avey et al., 2010b). It is suggested that the use of a PsyCap measure could be useful in establishing call centre employee levels of PsyCap. This would be valuable in informing selection and retention strategies in the call centre industry.

Recommendations for future research
It is recommended that future studies make use of a longitudinal design to determine the causal relationships between the variables of the study. Future studies can overcome the limitations of the generalisation of the findings by using a larger sample size across different contexts. The study's finding on the predictive relationship between PsyCap and organisational commitment is a starting point for future research. Also, the psychometric properties of the PCQ need to be explored further in the South African context.

Contribution
The research contributes to the study of positive psychology in the workplace. More specifically, it is a contribution to the positive resource capacities of call centre employees within the South African context. The study adds to the existing literature on PsyCap and its relationships with the organisational outcomes of work engagement and organisational commitment. More specifically, the study highlights the importance of the role of optimism as a PsyCap subdimension with regard to its impact on work engagement and organisational commitment amongst call centre employees.

Conclusion
People spend most of their lives in their working environments. It is becoming of such importance that managers in organisations cannot ignore the human factor in general (and PsyCap in particular) in their quest for longterm survival and excellence.
These research findings will benefit all parties in the workplace and pave the way for the development of intervention programmes to develop the PsyCap of employees in organisations, which will then lead to them being more productive workers.