is the process through which newcomers learn the requisite social and task knowledge in order to resolve role uncertainty and become organizational insiders. Successful socialization of newcomers implies better retention of employees, higher productivity, and reduced recruitment and training costs. Many organizational newcomers undergo professional socialization through education and related work experience during their schooling. These newcomers may respond differently to an organization's efforts to socialize them when compared with newcomers without any related professional education or work experience. The importance of prior work experience and professional education for organizational socialization of newcomers, however, has received attention only recently. The aim of the research reported in this paper is to investigate the moderating effects of prior related work experience and professional education on the relationship between organizational socialization tactics and newcomer's adjustment. The study was conducted with a sample of new graduates from an Asian university. Findings show that prior related work experience and professional education moderate the effects of socialization tactics on newcomer's role clarity, role conflict and organizational commitment. The moderators have effects on different outcomes and in opposite directions. The paper discusses theoretical and practical implications of these findings.