In the doctoral dissertation, we linked the concepts of personality traits, personal efficacy, and team effectiveness, using both qualitative and quantitative research methods. The idea for the research comes from practice because over the years we noticed the increasing importance of teamwork and team performance in the organization where we work. A review of theory has formed the expectation that personality traits have a great influence on personal efficacy and team effectiveness. In the first step, we conducted a pilot study using semi-structured interviews on a sample of 18 managers. In the second step, we used a mixed-research method. We performed a qualitative part on six focus groups of employees, and a quantitative part, using questionnaires on personality traits, personal efficacy, and team performance. In addition, we enlarged our participant group to 120 respondents, which enabled us to do statistical lienar regression for predicting team effectiveness. We found that the personality traits of openness, agreeableness and conscientiousness are correlated with personal efficacy. Agreeableness and openness were the key personality traits associated with team performance. Interestingly, emotional stability has not been shown to be important for both personal efficacy and team effectiveness in qualitative part of the research, however we did find some important negative correlations of pesonal efficacy and team effectiveness. Research showed that there are other factors besides personality traits that have a significant impact on personal efficacy and team effectiveness. The most important factors for personal efficacy were the support of the leader, the motivation of the individual and the goals. Other factors important for team effectiveness were leadership, goals, vision and purpose of the team, motivation, organizational culture, climate and environment, collaboration, informal networking and relationships between team members, diversity, expertise and knowledge, and team roles. Also, it is important to expose the importance of trust between team members. We tried to link personal efficacy and team effectiveness. Here, the importance of internal locus of control and self-confidence in personal efficacy and the role of leadership in team effectiveness were highlighted. We were also interested in differences between groups of differently performing individuals in personality traits, self-assessment of personal efficacy and understanding of team effectiveness. The key finding is that there are no differences in personality traits between differently performing individuals. However, there are differences between low-performing and high-performing individuals in their perceptions of personal efficacy and team effectiveness.
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