This paper outlines why program evaluation should follow well-respected scientific standards and why it should be performed by independent researchers.

Die vorliegende Arbeit analysiert Vor- und Nachteile des Einsatz objektorientierter Konzepte bei der Entwicklung von EDV-unterstützten Informationssystemen.

We study experimentally how taxpayers choose between two tax regimes to fund a public good. The first-best tax regime imposes a general, distortion-free income tax. However, this tax cannot be enforced. The second-best alternative supplements the income tax by a specific commodity tax. This tax...

This paper presents the results of an experimental study on unemployment benefit sanctions. The experimental set-up allows us to distinguish between the effect of benefit sanctions once they are imposed (the ex post effect) and the effect that unemployed want to avoid getting a benefit sanction...