Personality and team performance: a meta‐analysis

Using a meta‐analytical procedure, the relationship between team composition in terms of the Big‐Five personality traits (trait elevation and variability) and team performance were researched. The number of teams upon which analyses were performed ranged from 106 to 527. For the total sample, significant effects were found for elevation in agreeableness (ρ = 0.24) and conscientiousness (ρ = 0.20), and for variability in agreeableness (ρ = ?0.12) and conscientiousness (ρ = ?0.24). Moderation by type of team was tested for professional teams versus student teams. Moderation results for agreeableness and conscientiousness were in line with the total sample results. However, student and professional teams differed in effects for emotional stability and openness to experience. Based on these results, suggestions for future team composition research are presented. Copyright © 2006 John Wiley & Sons, Ltd.     

One hundred and fifty years of philosophy

Looking back from 2049 over one-hundred and fifty years of philosophy, a student's essay reveals what became of rival strands in Western philosophy – with a sidelong glance at the special Topoi issue on the theme “Philosophy: What is to be Done?” that was published almost half a century earlier.     

The linear utility model for optimal selection

A linear utility model is introduced for optimal selection when several subpopulations of applicants are to be distinguished. Using this model, procedures are described for obtaining optimal cutting scores in subpopulations in quota-free as well as quota-restricted selection situations. The cutting scores are optimal in the sense that they maximize the overall expected utility of the selection process. The procedures are demonstrated with empirical data.     

Long-term retention of a theatrical script by repertory actors: the role of context.

Four actors were requested to perform Sartre's No Exit after a retention interval of more than 5 months. Their recall of the play was studied either with the spatial and visual contextual cues normally available during a performance or without such cues. Total recall was still considerable, equalling 85%. The number of paraphrases of, and inferences on, the original text was however quite large (32%), suggesting that the actors had learned their lines according to their meaning rather than as a result of rote memorisation. The context manipulation showed that actors' recall is facilitated by the availability of spatial-visual information, but only to a limited extent. The relative importance of textual and contextual cues in the long-term retention of a play is discussed.     

Bayesian estimation and model selection in ordered latent class models for polytomous items

In a latent class IRT model in which the latent classes are ordered on one dimension, the class specific response probabilities are subject to inequality constraints. The number of these inequality constraints increase dramatically with the number of response categories per item, if assumptions like monotonicity or double monotonicity of the cumulative category response functions are postulated. A Markov chain Monte Carlo method, the Gibbs sampler, can sample from the multivariate posterior distribution of the parameters under the constraints. Bayesian model selection can be done by posterior predictive checks and Bayes factors. A simulation study is done to evaluate results of the application of these methods to ordered latent class models in three realistic situations. Also, an example of the presented methods is given for existing data with polytomous items. It can be concluded that the Bayesian estimation procedure can handle the inequality constraints on the parameters very well. However, the application of Bayesian model selection methods requires more research.     

Ego development and the ethics of care and justice: the relations among them revisited

This study examined the links among ego development and the ethics of care and justice in 144 Norwegian men and women, 15 to 48 years old, taking into consideration age, sex, education, and verbal intelligence. As expected, the relationship between Loevinger's model of ego development and care-based moral reasoning as measured with Skoe's Ethic of Care Interview (ECI) was significantly stronger than the one between ego development and justice as measured with Rest's Defining Issues Test (DIT). Both ethics correlated significantly with verbal ability. Analyses showed that beyond its overlap with verbal intelligence, the variance shared between the ECI and ego development was substantial. By contrast, when verbal intelligence was controlled, the DIT was not significantly related to ego development or to the care ethic.     

Refusing intergroup help from the morally superior: How one group's moral superiority leads to another group's reluctance to seek their help

We examine how group members paradoxically refuse intergroup help where they might need it most: in the moral status domain. Based on the Sacred Value Protection Model (Tetlock, 2002), we predicted and found that group members felt stronger group-based anger and a stronger motivation to reaffirm their group's moral status when an outgroup was morally superior to them. Despite this moral motivation, however, we also predicted and found that group members more strongly refused intergroup help to improve their moral status vis-à-vis the morally superior outgroup (compared to an uninvolved outgroup). Consistent with the Social Identity model of Deindividuation Effects (Reicher, Spears, & Postmes, 1995), group members thus strategically refused intergroup help to defend their group identity. Supporting this interpretation, particularly highly identified group members were most likely to refuse intergroup help when they needed it most. We discuss theoretical and practical implications of our findings.     

Time is on my side: optimism in intertemporal choice

The present research examines the role of optimism on time preferences for both losses and gains. It is argued that optimism has asymmetric effects on time preferences for gains versus losses: one reason why decision makers prefer immediate gains is because they are optimistic that these gains will be followed by additional gains in future. In contrast, decision makers prefer to delay losses because they are optimistic that losses are avoidable in the future. Optimism about outcomes affects time preferences for both gains and losses, such that low optimism reduces the discount rates while increased optimism is associated with higher discount rates. This prediction was supported in two different domains: monetary outcomes (Study 1), and health (Study 2). Implications of these results for both research practice and time preferences in the real world are discussed.     

Quality of life before and after lung transplantation in patients with emphysema versus other indications

Whether lung transplantation improves Health-related Quality of Life in patients with emphysema and other end-stage lung diseases before and after lung transplantation was examined. Between 1992 and 1999, 23 patients with emphysema and 19 patients with other indications completed self-administered questionnaires before lung transplantation, and at 4, 7, 13, and 25 mo. after transplantation. The questionnaire included the Nottingham Health Profile, the State-Trait Anxiety Inventory, the Self-rating Depression Scale, the Index of Well-being, the self-report Karnofsky Index, and four respiratory-specific questions. Neither before nor after transplantation were significant differences found on most dimensions of Health-related Quality of Life between patients with emphysema and other indications. Before transplantation, both groups report major restrictions on the dimensions Energy and Mobility of the Nottingham Health Profile, low experienced well-being, depressive symptoms, and high dyspnea. About 4 mo. after transplantation, most Health-related Quality of Life measures improved significantly in both groups. These improvements were maintained in the following 21 mo.