In September 2006, the Dutch authorities opened a special detention facility for terrorism related offenders1 in the penitentiary institution in Vught. This terrorism wing was designed to prevent terrorist detainees from recruiting or radicalizing ‘regular’ prisoners. Immediately after its opening, a public debate began regarding the appropriateness and effectiveness of this intervention. In response, the Minister of Justice pledged to the House of Representatives that he would have the terrorism wing evaluated after three years. The present report is the outcome of this evaluation research.