AbstractMost evaluation studies for Germany's active labor market policy (ALMP) indicate that subsidized employment programs in the public sector (public works programs, „Arbeitsbeschaffungsmaûnahmen“) and publicly funded training programs have, on average, no or even negative effects on individual re-employment probabilities. This paper provides possible explanations for the ineffectiveness of these programs, where we focus on heterogeneous treatment effects, which are not accounted for in the German evaluation studies due to lack of data, and locking-in effects, in particular related to the relatively high level of income support for participants in these programs. Since there is very little direct evidence on these effects for Germany to date, we draw on results from evaluation studies for other European countries. We argue that the success of ALMP is to a large extent determined by design features like the targeting of particular groups and the incentives from the coordination with unemployment insurance as well as the incentives of program administrators and local governments.