The reviews summarise the research evidence and, therefore, they do not include all of the material contained in the database. Only entries based on original research, systematic reviews or meta-analyses are included. Such entries all had written methodological notes. They were identified and extracted from the database by searching all entries that included a methodological note. This search took place in November 2001. Studies that were purely descriptive of promotion were excluded, and all studies which touched in some way on the four review questions were then included. The reviews were drafted, and in July 2002 a further group of relevant newer studies were added to the reviews. It is intended that the reviews will be updated periodically as the database grows.