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This study aims to explore relationships among supervisors’ socialization behaviors, newcomers’ socialization outcomes, organizational commitment, and work outcomes in three large companies in Korea.

The research was conducted via an online survey in three large firms in Korea. The sample comprised newcomers who had worked for more than six months but less than one year in these firms. The collected data were analyzed using descriptive statistics and structural equation modeling (SEM).

Derived from SEM, the study’s results confirmed a causal relationship between supervisor’s socialization behaviors and newcomer’s work outcomes, which was fully mediated by newcomer’s socialization outcomes. However, organizational commitment was observed as a mediating variable, not a moderating variable. All types of supervisors’ socialization behaviors were related to newcomers’ socialization outcomes. Providing appropriate feedback, supporting newcomers’ development and improving social relationships were most strongly related to newcomers’ socialization outcomes.

This study proposed a rationale for the potential effectiveness of supervisor socialization behavior training. Related variables such as supervisor training aspects and the effectiveness of supervisor training for newcomers’ organizational socialization could be examined further.

The study offers critical areas to consider when designing training programs focused on supervisors’ socialization behaviors. Human resource development practitioners should be aware of the importance of supervisors’ socialization behaviors for newcomers’ organizational socialization and develop a program to improve all types of supervisors’ socialization behaviors.

New areas of training and development for supervisors can be proposed to improve newcomer organizational socialization and, eventually, to enhance the work outcomes of newcomers.