An experimental study was made of the problem of separated flow with reattachment at subsonic speeds in various geometrical configurations. It was found that when the boundary layer thickness at separation was small, the values of the reattachment pressure rise coefficient agreed with those from the Korst-Chapman theory. The importance of the relative positions of the transition and reattachment was investigated. In the free shear layer, transition occurred at Reynolds numbers as low as 3 x 10[superscript 3], based on distance from the separation point.