Core self-evaluation (CSE) is a concept that encompasses an individual's subconscious, fundamental evaluations about themselves, their own abilities, and their control over their environment. Employee A exhibits traits such as self-doubt, reliance on routine tasks, and a feeling of powerlessness, which are indicative of a negative core self-evaluation. Conversely, Employee B displays initiative, sets ambitious goals, and believes in the team's ability to influence the environment, which are characteristics of a positive core self-evaluation.
References:
* Judge, T. A., & Bono, J. E. (2001). Relationship of Core Self-Evaluations Traits-Self-Esteem, Generalized Self-Efficacy, Locus of Control, and Emotional Stability-with Job Satisfaction and Job Performance: A Meta-Analysis. Journal of Applied Psychology, 86(1), 80-92.
* Robbins, S. P., & Judge, T. A. (2017). Organizational Behavior (17th ed.). Pearson.

Self-managed teams rely on employees to make decisions collectively and autonomously. An "initiative-taking training program" equips employees with the skills and confidence to make decisions and take initiative without constant supervision, which is a key aspect of employee-driven decision making in self-managed teams.