At the "2nd European Workshop on Stem Cell Methodology," held in Mulhouse, France, on May 3-7, 1993, part of the meeting was dedicated to the positive selection of CD34+ cells. All devices that are currently in use, or will be available in the near future, were explained and practically demonstrated using human cell populations by scientists involved in their development. In this paper, a review of these methods is given in the form of a short description, together with the data presented in Mulhouse and available from the literature.