This study examined the (1) effects of a supportive program (i.e., induction arrangement) on beginning teachers' (BTs') psychological processes after a period of 1 year and (2) psychological paths of influence of the arrangement. Participants (56 Dutch secondary schools with 143 BTs) were randomly allocated to two conditions. Experimental schools provided a carefully developed and implemented induction arrangement to their BTs. Control schools followed their regular (induction) arrangements. BTs perceived stress causes, self-efficacy, and job strain were measured with a pre-test post-test design. Condition effects were examined by means of independent sample t tests. The perception of the provided support was measured, and its psychological path of influence was investigated by conducting standard multiple regression analyses. BTs in the experimental condition indicated that they (1) received more support, (2) experienced fewer stress causes (i.e., lack of learning opportunities and lack of regulating possibilities), and (3) experienced more self-efficacy in the classroom at the end of the school year. Furthermore, fewer BTs left the experimental schools after 1 year. Reducing BTs' workload and supporting their professional development are the most influential induction arrangement elements provided in this study. Providing carefully developed and implemented induction arrangements may soften the harshness of the context in which BTs operate, by decreasing their perceived stress causes and increasing their level of self-efficacy in the classroom. This, in turn, could positively affect BTs' decision to stay in the teaching profession and might, therefore, add to a solution to the teacher shortage problem.