Displacement chromatography has been shown to be a powerful technique for the simultaneous concentration and purification of biomolecules. Despite its distinct advantages, the displacement mode of chromatography has remained a relatively unknown technique. This is rapidly changing, however, as evidenced by the increasing number of papers on displacement chromatography in the literature and presentations at major conferences during the past few years. Much of this work has been reviewed by Frenz and Horvath l. In fact, there has been a quiet revolution in the perception of the preparative chromatographic community with respect to displacement chromatography. In this report, we will present some of the more recent advances, post 1987, in the theory and practice of the technique. Theoretical work on ideal. © 1990, Taylor & Francis Group, LLC. All rights reserved.