In the context of Ajzen's (1991) theory of planned behavior, the antecedents of intentions are better understood than the antecedents of behavior. The current study aimed to improve the understanding of the transition from intentions to behavior. Based on the work of Gollwitzer (1993), Kuhl and Beckmann (1994), and Lay (1986) we proposed a model of mediators (i.e., implementation intentions) and moderators (i.e., action-state orientation and trait procrastination) in the intention-behavior relation. The model was applied to job seeking, and tested using longitudinal survey data of a sample of unemployed individuals in The Netherlands (N=175). Support was found for the proposed mediating role of implementation intentions in the relation between job search intention and job search behavior. The proposed moderating roles of action-state orientation and trait procrastination were not supported.