Two decades of "research-practice" encounters in the development of European therapeutic communities for substance abusers.

In 1981, a "research-practice" breakthrough was realized through the foundation of the European Federation of Therapeutic Communities (EFTC). Since its foundation EFTC regularly organized conferences and symposia. A few years later (in 1983), the European Workshop On Drug policy Oriented Research (EWODOR) was established at the Erasmus University in Rotterdam, including a special section devoted to the therapeutic community (TC). The authors examined the proceedings of all meetings organized by EFTC and EWODOR. The major topics presented throughout the last 20 years are highlighted in a chronological selection and these presentations largely focus on the challenges of the TC and the state of the art regarding scientific knowledge. In this overview only those authors who published articles in scientific journals indexed in the "Web of Science" (Institute for Scientific Information-ISI) were retained. Although research has never been the primary consideration in TCs, it played a far from negligible role in its development. Research findings prompted innovations and thus often provoked resistance, but on the other hand they functioned as a catalyst between the necessity of a belief system and the reality of society. The role of "grey" literature and the availability of information through the Internet will become more and more important in the communication between researchers and practitioners.