Whereas coaching is very popular as a management tool research on coaching effectiveness is lagging behind. Moreover the studies on coaching that are currently available have focused on a large variety of processes and outcome measures and generally lack a firm theoretical foundation. With the meta-analysis presented in this article we aim to shed light on the effectiveness of coaching within an organizational context. We address the question whether coaching has an effect on five both theoretically and practically relevant individual-level outcome categories: performance/skills well-being coping work attitudes and goal-directed self-regulation. The results show that coaching has significant positive effects on all outcomes with effect sizes ranging from g = 0.43 (coping) to g = 0.74 (goal-directed self-regulation). These findings indicate that coaching is overall an effective intervention in organizations.
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