Using the longitudinal survey data of newcomers working for Japanese firms, this study demonstrates that the socialization tactics used by Japanese firms were positively related to the degree of socialization of newcomers, which eventually correlated positively with the time-series differences in organizational commitment and achievement motivation from the first year (T1) to the second year (T2) of their organizational entry, and negatively with the longitudinal change in turnover intention from T1 to T2. In addition, the results show that the newcomers' attitudes toward their pre-entry job search efforts, as with their entry (T1), had a negative influence on the change in value commitment from T1 to T2, indicating that those who rated their past job search activities as successful tended, as of their entry into the organization, to diminish their level of acceptance of their organization's values over a year. Findings are used to discuss how firms can effectively manage their entry-level employees to facilitate their adjustment and retention.