The Five-Factor model and job performance in low complexity jobs: A quantitative synthesis

Personality inventories are frequently used by small and medium-size companies in their personnel ion processes (Alonso, Moscoso, & Cuadrado, 2015) and several meta-analytical reviews on the relationship between personality and job performance have been carried out during the last two decades (e.g., Barrick & Mount, 1991, 1993; Barrick, Mount, & Judge, 2001; Hogan & Holland, 2003; Hough, 1992; Judge, Rodell, Klinger, Simon, & Crawford, 2013; Salgado, 1997, 2002, 2003; Salgado, Anderson, & Tauriz, 2015; Salgado & Tauriz, 2014; Tett, Jackson, & Rothstein, 1991). These meta-analyses have shown that the Big Five personality factors are valid predictors of important work behaviors. For example, Barrick and Mount (1991) found that conscientiousness was a valid predictor of job performance, and that it generalized the validity across jobs and criteria. These researchers also showed that the other factors are predictors of some criteria for some jobs. Hough (1992) also found that personality measures are predictors of several organizational and educational criteria. In Europe, Salgado (1997) found that conscientiousness and emotional stability were valid predictors of job performance across jobs and that extroversion, openness, and agreeableness were valid predictors for specific occupations and criteria.

The most recent meta-analyses (e.g., Judge et al., 2013; Salgado, 2003; Salgado, Anderson et al., 2015; Salgado, Moscoso et al., 2015; Salgado & Tauriz, 2014) have confirmed the previous findings and shown that the validity of the Five-Factor Model (FFM) can be larger depending on the way in which the personality factors are measured (e.g., with personality inventories developed using the FFM framework and if the personality inventories are quasi-ipsative forced-choice personality inventories).

Recent research has also shown that the FFM predicts occupational attainment, expatriate cross-cultural adjustment and outcomes, creativity and innovation, and erproductive behaviors at work (AlDosiry, Alkhadher, AlAqraa, & Anderson, 2016; Costa, Páez, Sánchez, Garaigordobil, & Gondim, 2015; Gilar, De Haro, & Castejón, 2015; Raman, Sambasiva, & Kumar, 2016; Salgado & Bastida, 2017). Moreover, research on applicant reactions has shown that personality inventories are well rated across the world (Aguado, Rico, Rubio, & Fernandez, 2016; Anderson, Ahmed, & Costa, 2012; Anderson, Salgado, & Hülsheger, 2010; Liu, Potocnik, & Anderson, 2016; Snyder & Shahani-Denning, 2012).

Despite the empirical evidence of the validity of the FFM, several researchers have criticized personality variables on the basis that they can be affected by faking when the individual is motivated to do it, for instance, in personnel ion processes (Grieve & Hayes, 2016; Morgeson et al., 2007; Salgado, 2016).

Taken together, the results of these reviews make two conclusions appear reasonable. First, the FFM can reasonably predict job performance and its sub-dimensions. Second, the Five Factor Model is a good taxonomy for integrating the personality measures developed from different theoretical perspectives.

However, there are a number of issues that additional research. For instance, the potential moderator effects of job components on the validity of the FFM have received less attention. For example, few studies have examined whether the validity of the Big Five can be affected by job complexity, defined as the degree of information processing d by the tasks (Hunter & Hunter, 1984; Schmidt, Shaffer, & Oh, 2008). Hunter and Hunter (1984) found that the data dimension of the occupational code of the Dictionary of Occupational Titles (DOT; US Department of Labor, 1991) mainly represents a job complexity dimension. Family II (feed) and V (compare/copy) would the low complexity jobs. According to Hunter and Hunter (1984), low complexity jobs represent about 20.1% of occupations and they are more characterized by individual duties. Therefore, these characteristics may a different set of personality variables than more complex occupations.

There is some empirical evidence that job complexity can moderate the relationship between personality and job performance. For example, Spector (1982) found that high anxiety (low emotional stability) was negatively related to job performance in complex tasks but was not related to performance in simple, less complex tasks. Judge, Bono, and Locke (2000) found that job complexity correlated negatively with neuroticism and positively with self-esteem, generalized self-efficacy, and locus of control.

Moreover, performance is defined as any behavior or activity, under the individual's control, adjustable in terms of ability and relevant for the organizational goals (Campbell, 1990). Nowadays, there is a consensus that the job performance domain s at least two dimensions: task and contextual performance (Aguinis, 2007; Moscoso, Salgado, & Anderson, 2017; Salgado & Cabal, 2011). Task performance is defined as the proficiency with which employees perform the core technical activities that the job deion s (Borman, Bryant, & Dorio, 2010). Contextual performance refers to the contributions of the employee, that go beyond the technical obligations of the work, and that impact on the organizational, social, and psychological environment, helping to accomplish organizational goals (Borman, Penner, Allen, & Motowidlo, 2001; Dorsey, Cortina, & Luchman, 2010; Hoffman & Dilchert, 2012). Furthermore, Van Scotter and Motowidlo (1996) subdivided contextual performance into two narrower dimensions: interpersonal performance and job dedication.

The main objective of this article is to the validity of the Big Five personality dimensions for predicting performance in jobs that involve a low level of complexity. From a theoretical perspective, job complexity can be a relevant moderator of validity. For example, Judge et al. (2000) showed that job complexity moderated the relationship between personality and job satisfaction. Therefore, understanding the personality correlates of occupations of a low complexity level can be relevant in developing models and theories of work behaviors and performance.

In order to provide some insight into the validity of the Big Five, we first present the results of four primary studies in which a FFM-based inventory was used to assess personality and we examine the relationship of the Big Five with overall job performance, task performance, and contextual performance. The four studies were conducted in jobs of a low complexity level. Next, we report the results of a meta-analytic integration of the findings of the four studies.

Previous research has demonstrated that the facets d in the FFM did not incremental validity over the Big Five factors (Salgado, Moscoso, & Berges, 2013; Salgado, Moscoso et al., 2015). Therefore, this study has been conducted at the Big Five level. This approach has the advantage of not requiring the correction of the observed validities for imperfect construct measurement, as some researchers have done in previous meta-analyses in which scales of facets were meta-d with factor scales (e.g., Mount, Barrick, & Stewart, 1998; Salgado, 1997, 2003).

Based on the findings of previous meta-analyses and primary studies, we posit three hypotheses:Hypothesis 1

Emotional stability and conscientiousness are valid predictors for overall, task, and contextual performance ratings.

Hypothesis 2

Extraversion is a valid predictor for overall job performance and task performance.

Hypothesis 3

Agreeableness is a valid predictor of contextual performance.

As four independent studies were carried out, four independent samples were collected for doing the primary studies. The characteristics of these samples are described below:

Study 1: The participants of study 1 were 32 individuals who worked as private security agents in a Spanish based company at the time of testing. All the subjects were male and their age ranged from 25 to 32 years. All of them had been employed by the company for at least four years. The subjects and the supervisors of a local office of the company were invited to participate in this study. They were informed that a validation study of a personality questionnaire was being conducted. Around 50% of the employees agreed to participate in the study. The supervisors provided performance ratings of the employees they supervised. The study design was concurrent.

Study 2: The participants of this study were 46 male employees of a Spanish cold storage company who participated voluntarily in an organizational assessment program at the company. All subjects were male and their age ranged from 31 to 56 years. All of them had been employed by the company for several years. They were informed that an organizational assessment program was being conducted in order to provide information, suggestions, and future improvements. Around 96% of the employees agreed to serve as subjects for the study. The study design was concurrent.

Study 3: The sample of the third study consisted of 72 weavers in a medium-size Spanish textile factory. In this case, the sample was ed on the basis of their scores on a FFM-based personality inventory and supervisory ratings of job performance were collected six months later. Therefore, the study design was predictive.

Study 4: The participants consisted of 44 male operators of a medium-size Spanish ceramics company. They participated voluntarily in the study and their direct supervisor provided job performance ratings. Their age and tenure was similar to the previous samples. The study design was concurrent.

In all the studies personality was assessed at the factor level, that is, we assessed emotional stability, extroversion, openness, agreeableness, and conscientiousness. Two personality inventories, developed within the FFM framework, were used for assessing the factors. Their psychometric characteristics are described below.

IP/5F. This 200-item inventory was developed through rational and factor analytical methods to measure the five personality factors of the Big Five model (Salgado, 1996, 1998). Items were grouped into 29 homogeneous item clusters based on item content. Items are answered by one of 3 alternative options: agreement, indecision, and disagreement. The Emotional Stability (ES) factor s the clusters of hostility, stress, sadness, anxiety, not-worrying, insecurity, and control/relaxation. Extraversion (EX) s the clusters of assertiveness, group sense, reserved, sense of humor, leadership, and self-centered. Openness to Experience (O) s the clusters of imagination and intuition, creativeness, adventurousness, amplitude of interests, and non-conventionality. Agreeableness (A) s the clusters of honesty, modesty, cooperativeness, tolerance, and trust. Conscientiousness (C) s the clusters of work effort, order and organization, carefulness, prudence, high performance, and dutifulness. The internal consistency coefficients for ES, EX, O, A, and C are .90, .86, .80, .74, and .87, respectively. One year test-retest reliabilities for ES, EX, O, A, and C were .91, .90, .79, .65, and .72, respectively. The reliability of the homogeneous item clusters ranged from .57 for tolerance (agreeableness) to .84 for anxiety (emotional stability), and the mean was .71, .69, .68, .67, and .72 for ES, EX, O, A, and C, respectively. Convergent and discriminant validity evidence was found using the HPI (Hogan & Hogan, 1995; Salgado et al., 2013), the NEO-FFI (Costa & McCrae, 1992), the EPI (Eysenck & Eysenck, 1975), the CEP (Moscoso & Salgado, 2004), and the 16PF (Cattell, Eber, & Tatsuoka, 1970). For example, the correlations between IP/5F and the NEO-FFI factors measuring corresponding constructs were .70, .88, .55, .55, and .58 for ES, EX, O, A, and C, respectively. In another study (N = 200), the correlations between the HPI and the IP/5F were .75 for ES, .69 and .74 for EX (the HPI divides Extraversion into two subfactors), .85 for O, .51 for A, and .67 for C (Salgado, Moscoso, & Lado, 2003). A further study (N = 410) shows that the correlations between IP/5F and the NEO-PI-R were .84, .80, .64, .72, and .78 for ES, EX, O, A, and C, respectively (Salgado, Moscoso et al., 2015). Therefore, as a whole, the IP/5F has shown excellent convergence with other personality inventories assessing the same personality dimensions. Exploratory and confirmatory factor analyses confirmed the five-factor structure of the IP/5F (Salgado, 1996). This inventory was used in studies 1, 3, and 4.

Deion en Cinq Dimensions (D5D). The D5D questionnaire measures the five domains of the FFM (Rolland & Mogenet, 2001). The questionnaire s 55 trait adjectives as markers for the five domains; each domain is represented by 11 adjectives that are scored on a 6-point Likert scale, ranging from absolutely not characteristic of me (1) to fully characteristic of me (6). The D5D has accumulated evidence of adequate reliability for the big five dimensions: emotional stability (.84), introversion (.79), openness (.74), agreeableness (.84), and conscientiousness (.77); moreover, the D5D has also demonstrated adequate convergent correlations with the domains assessed by the NEO-PI-R (Costa & McCrae, 1992), ranging from .54 (Agreeableness) to .73 (Conscientiousness). This personality inventory was used in study 2.

Two measures were used to evaluate job performance. The first one was specifically designed to evaluate job performance for the study of security agents. The second instrument was used in the other three studies. Next, we describe the two scales used in this research to appraise job performance and its sub-dimensions.

Security Agent Performance Scale: Twenty competencies for the security agent job were identified in this research. Job analysis using interviews with the agents and their supervisors were carried out. Also, 44 subjects were asked to communicate critical incidents in the job and an extensive deion of an “ideal” security agent. 26 critical incidents and 38 deions of an “ideal” agent were collected. Then, three researchers using this information developed the following competencies: (1) compliance with labor standards and rules, (2) personal initiative, (3) stable and controlled mood (calm), (4) relationships with co-workers, (5) relationships with supervisors (6) order and thoroughness at work, (7) personal presence, (8) punctuality, (9) resistance to monotony, (10) ability to solve problems/difficulties, (11) positive vision of the service, (12) ability to persuade and influence effectively, (13) analytical and reflexive behavior, (14) self-confidence, (15) professional knowledge, (16) relationships with customers/users, (17) availability for service, (18) work motivation, (19) decision-making ability and (20) global assessment of the employee.

Two immediate supervisors rated the participants on each competence using a 5-point scale (1= unsatisfactory, 5 = excellent). After, the mean score was calculated for each competence. The inter-rated reliability ranges from .504 to .80 with a mean of .643 (SD=.096).

Job Performance Scale: In the other three studies, performance was rated by the employee's immediate supervisor using 10 behaviorally anchored rating scales (BARS), which were developed through the critical incident technique (Flanagan, 1954). Each BARS used a 5-point scale ranging from poor performance (1) to excellent performance (5). The job dimensions rated in studies 2, 3, and 4 were: (1) technical knowledge, (2) ability to persuade and influence effectively, (3) relationships with supervisors, (4) order and organization in the workplace, (5) meticulousness in the tasks, (6) stable and calm mood, (7) availability for service, (8) productivity, (9) job motivation, (10) relationships with co-workers, and (11) overall job performance.

The participants in the first study completed the IP/5F while attending a training session at the company. Later, each subject received two independent appraisals from two supervisors, who used the scale described above. The supervisors were blind to the subjects’ scores on the IP/5F. The ratings were used for research purposes only.

In the case of sample two, the subjects participated in an organizational climate study. During this study, they completed the D5D (Rolland & Mogenet, 2001), which was not relevant for the climate study purposes. The employee performance was rated by the direct supervisor. The ratings were collected for research purposes only, which means that the supervisors did not have to justify their evaluations. The supervisor was blind to the scores of the participants in the personality inventory.

In the case of sample three, the participants were applicants and they answered the IP/5F together with several additional tests with no relevance for the present study. The scores were used to make hiring decisions. Job performance was rated by the immediate supervisor, who was unaware of the scores of the employee on the IP/5F. The performance ratings were used for research purposes exclusively. The study design was predictive.

Finally, in the case of the sample four, the participants completed the IP/5F voluntarily and their performance ratings were provided by the direct supervisor, who agreed to participate in the study, and who were blind to the employee personality scores. In this case, the supervisor only provided the overall evaluations of the workers, so it was not possible to know the scores obtained for task and contextual performance. The study design was concurrent and the performance ratings and the personality scores were used for research purposes only.

Two types of statistical analyses were done. First, the correlations between the FFM and job performance were calculated for each individual sample. Next, the results of the four samples were used to conduct a psychometric meta-analysis.

In order to carry out the meta-analysis, four artefactual errors were considered: sampling error, measurement error in predictor and criterion, and range restriction in the predictor. The four errors produce error variance and the measurement error and range restriction also produce an underestimation of the true correlation between predictor and criterion. Consequently, three artifact distributions were developed.

Predictor reliability. In Table 1 the reliability for each personality factor for the two personality inventories and the average of the reliability and the standard deviation for each personality factor appears. In the meta-analysis, we used these distributions to correct for measurement error in the predictors.

Criterion reliability. When a measure of employee performance is the criterion used in validation studies, there are several reliability coefficients that can be used to correct for criterion reliability. However, the inter-rater coefficient is the most accurate, since it controls for the majority of the measurement error sources (Rodriguez, 2016; Salgado, 2015; Salgado & Moscoso, 1996; Salgado, Moscoso, & Anderson, 2016; Salgado, Anderson et al., 2003; Schmidt & Hunter, 1996; Schmidt, Le & Ilies, 2003; Viswesvaran, Ones, & Schmidt, 1996). Due to the fact that the interrater reliability was available only for the first study, we used an empirical distribution based on the coefficient reported by Salgado et al. (2016). The results of their second-order meta-analysis reported that the interrater reliability for a single rate was .52, and the combined standard deviation was .105.

Range restriction of predictor. In order to check if the personality measures were affected by range restriction, we compared the standard deviation of the samples with the standard deviation reported by the authors of the instruments used (Rolland & Mogenet, 2001; Salgado, 1998). The u values are reported in Table 2.

We conducted a psychometric meta-analysis, aggregating the results found with the primary samples, using the software package developed by Schmidt and Le (2014), based on the meta-analysis methods of Schmidt and Hunter (2015).

Firstly, the validity coefficients for the Big Five found in the four samples that make up this study are reported. The results for overall job performance are explained in the first place and results for task and contextual performance are presented below. Finally, a more detailed explanation of the results is offered when the results of the meta-analysis (carried out from the aggregate of the primary samples) are reported.

Table 3 shows the observed validity coefficients of the Big Five for predicting overall job performance in the four samples d in this study. The first column presents the sample sizes, which oscillate between 32 in the first sample and 72 in the third one. The next column reports the validity coefficients for each personality factor. The observed validity coefficients found for emotional stability varied from .10 in the sample of unskilled workers to .28 in the sample of security agents. With regard to the extroversion factor, the lowest coefficient was .13 for the sample of operators and the highest value was .39 (security agents). On the other hand, the values obtained for openness to experience ranged from -.18 (operators) to .22 (security agents), and the values for agreeableness ranged from -.07 (security agents) to .31 (unskilled workers). The validity coefficients for conscientiousness ranged from .09 (operators) to .36 (unskilled workers).

The validity coefficients of the Big Five for predicting task performance are reported in Table 4. Task performance was evaluated in only two of the samples d in the current study (operators and weavers). The results for emotional stability ranged from .03 for the sample of operators to .28 for the weavers. With regard to extroversion, the lowest value was .06 (operators) and the highest was .16 (weavers). For their part, the validity coefficients for openness to experience ranged from -.08 to .03. In the case of agreeableness, the values ranged from -.06 to -.03. The values found for conscientiousness were both positive and very similar (.17 and .14).

The results related to contextual performance are presented in Table 5. The samples that d a measure of contextual performance were the same as in the case of task performance. The validity coefficients for contextual performance were .11 and .21 for the factor of emotional stability, .17 and .18 for extroversion, -.13 and -.02 for openness to experience, .02 and .14 to agreeableness, and .03 and .11 for conscientiousness.

Table 6 presents the results of the meta-analysis of the predictive validity of the Big Five in low complexity jobs that we calculated using the results of the primary samples collected in this research. From left to right, the first column shows the total sample size (N), the second column indicates the number of effect size coefficients (K), the third column is the average effect size weighted by sample size (rw), and the next three columns the observed variance (S2Obs), the observed standard deviation (SDObs) and the variance due to sample error (S2SE). The operational validity (rop) and the true effect size (ρ) are shown in the seventh and eighth columns, respectively. The variance of the true effect (S2ρ) and the percentage of the observed variance aced for by artefactual errors (% VE) are reported in the next columns. Finally, the 90% credibility value (90% CV) and the 95% confidence interval of ρ (95% ICρ) appear in the last two columns.

The findings for overall job performance are shown at the top of the Table. The number of samples used in these meta-analyses was 4, with a total accumulated sample of 194 individuals. The first row shows the results for emotional stability. The observed validity was .19, which increased to .31 when it was corrected for criterion reliability and range restriction in the predictor (operational validity). The true validity (fully-corrected correlation) was .32, which coincides with the 90% credibility value, as the percentage of the variance aced for by artefactual errors was 100%. The lower and upper limits of the 95% confidence interval for ρ ranged from .29 to .34, which confirms that, besides generalizing the validity, the result is statistically significant. These results supported Hypothesis 1.

The results for extraversion are shown in the second row. The observed validity was .20, the operational validity was .32, and the true validity .35 (validity generalization is confirmed). In this case, the limits of the 95% confidence interval were .32 and .38. These results showed that extroversion was the personality factor with the highest validity coefficient for the low complexity jobs d in these meta-analyses, even higher than emotional stability and conscientiousness. The results supported Hypothesis 2.

In the next row appear the results for openness to experience, whose estimates of validity were .04, .06, and .07 for observed, operational and true validity, respectively. For openness to experience, the lower and upper limits of the 95% CI were .06 and .08, respectively. The 90% CV was positive, which means that the validity is generalized, but near to 0. For agreeableness, the observed validity was .05 for agreeableness. The operational validity was .06 and the true validity was .08. The 95% CI ranged from .07 to .09, but as in the previous factor, near to 0.

In the case of conscientiousness, the observed validity was .18, the operational validity was .31, and the true validity was .32 (predictive validity is generalized). The 95% CI for this factor ranged from .30 to .34, and the 90% CV was positive. Therefore, these results supported Hypothesis 1.

The next section of Table 6 shows the meta-analysis results for task performance. In this case, the meta-analysis d the two samples which measured this performance facet. The results that emotional stability obtained the higher values, for observed validity (.18), operational validity (.30) and true validity (.31), which generalized its validity. With regard to extroversion, the observed validity was .12, the operational validity was .21, and the true validity was .23. These results confirm Hypothesis 2, but although this factor is a good predictor of task performance and its validity is generalized, its predictor capacity is lower than for overall job performance.

For its part, openness to experience obtained an observed validity of -.01, which increased to -.02 in the case of true validity and operational validity. In relation to agreeableness, the results obtained were similar to the previous factor. In fact, the observed validity was -.04 and the operational validity and the true validity were -.05 and -.06, respectively. With regard to these two factors, we can conclude that neither is a predictor of task performance.

Finally, the results related to conscientiousness showed an observed validity of .15 that, when corrected for predictor reliability and range restriction, increased to .28 (operational validity) and to .29 when in addition it was corrected for criterion reliability (true validity). Predictive validity is generalized for this factor. These results are in accordance with the previous literature and, therefore, support Hypothesis 1.

The final part of the table shows the results in relation to contextual performance. Firstly, the observed validity reported for emotional stability was .17, which increased to .28 for operational validity and to .29 for true validity, and that generalizes its validity as a predictor of contextual performance. Secondly, the values found for the extroversion factor were the highest for contextual performance: .18 (observed validity), .31 (operational validity), and .33 (true validity), which also generalizes its validity. The next values reported on the table were about openness to experience, which ranges from an observed validity of -.06 to a true validity of -.10 (in this case the operational validity was -.09), in accordance with the previous results for overall job performance and task performance. Regarding agreeableness, the observed value was .09, the operational value .12, and the true validity .14. This means that agreeableness proves to be a good predictor of contextual performance in low complexity jobs and that it generalizes its validity, which confirms Hypothesis 3. Finally, the observed validity for conscientiousness was .08, which increased to .15 both for operational and true validity, which means that this factor predicted contextual performance and generalizes its validity too.

The capacity of the FFM to predict various organizational criteria has been extensively studied. Research has also suggested that job complexity can moderate the validity of the Big Five personality dimensions. However, there are hardly any studies on the relationships between personality and job performance for low complexity jobs. This research aimed to provide some evidence of the validity of the Big Five in low complexity occupations for predicting OJP, TP, and CP. For this purpose, four independent samples were used and, subsequently, a meta-analysis was conducted with the results of the four primary studies. The results supported the three hypotheses we had posited.

This article makes several relevant contributions. First, it shows that emotional stability and conscientiousness were consistently predictors of overall job performance, task performance, and contextual performance and that they generalized validity across the four low complexity jobs d in this research. The findings also that conscientiousness predicts overall job performance and task performance better than it does contextual performance in low complexity jobs. Emotional stability predicted the three criteria similarly.

The second contribution of this research has been to that extroversion was a relevant predictor of the three performance criteria. Extroversion showed a particularly large validity for predicting overall performance and contextual performance. The validity size in both cases was over .30. The validity was also significant for task performance although slightly smaller. We had hypothesized that extroversion would be a predictor of overall job performance and task performance but we did not hypothesize its predictive validity for contextual performance. Therefore, this is an unexpected but important finding. In fact, the results for extroversion reveal that this personality factor is the most important factor for predicting overall performance in the four low complexity occupations examined in the current research.

With regard to agreeableness, the results supported Hypothesis 3, as this personality factor was shown to be a predictor of contextual performance, although the magnitude of the validity is small.

A third contribution of this research has been to that the variability observed in the validities was fully explained by artefactual errors, mainly sampling error. Consequently, the predictive validity for the FFM as a whole generalized across the four occupations.

These findings have some implications for the theory and practice of personnel ion. From the theoretical point of view, the findings suggest that job complexity can moderate the validity of the Big Five. This is particularly relevant in the case of extroversion as previous meta-analytic research had shown that it was a relevant predictor for occupations characterized by interpersonal situations. None of the jobs d in this research had significant interpersonal ments. However, extroversion was a predictor of the three performance criteria and not only of contextual performance. Another theoretical implication is that conscientiousness may be a better predictor of task performance and overall performance than of contextual performance. In regard to emotional stability, the results disagree with Spector's (1982) findings that emotional stability is not related to performance in low complexity tasks. On the contrary, emotional stability is a crucial predictor of the three performance criteria in these four occupations. Therefore, as a whole, the findings suggest two points. First, a theory of job performance should job complexity as a potential moderator of the validity of personality factors. Second, the theory of job performance has to be comprehensive in the sense that a different set of personality factors may be necessary to predict the various performance criteria.

From a practical point of view, the findings have implications for the practice of personnel ion. The findings suggest that a combination of emotional stability, extroversion, and conscientiousness can predict job performance and its sub-dimensions very efficiently in low complexity occupations. Taking into ac that the applicant reactions to personality inventories are generally good (Anderson et al., 2010), the combination of these three factors can be very efficient alone or in combination with other predictors, such as cognitive ability tests and behavioral interviews.

This research has some limitations that should be mentioned. The first limitation is that we tested the hypotheses in only four jobs and they are not necessarily a representative sample of low complexity occupations. Therefore, future research should be conducted with additional occupations characterized by a low complexity level. The second limitation is that the samples were small in all cases and the cumulative sample was also small. Thus, the validity estimates can change as the sample increases. Therefore, additional studies for these occupations are also needed.

In summary, the findings suggest that emotional stability, conscientiousness, and extroversion are three robust predictors of supervisor ratings of performance in four low complexity jobs. A combination of these three factors can result in a substantial amount of predictive efficiency in personnel ion processes.

The authors of this article declare no conflict of interest.

The two authors contributed equally. The research reported in this manu was supported by Grant PSI2014-56615-P from the Spanish Ministry of Economy and Competitiveness and Grant 2016 GPC GI-1458 from the Consellería de Cultura, Educación e Orden, Xunta de Galicia.