2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/77631The aim of this survey article is to cover most of the recent research on preopen sets. I try to present majority of the results on preopen sets that I am aware of.To appear in the Proceedings of the 1998 Yatsushiro Topological Conference, 22-23 August 1998General Topology54-02; 54-06; 54G; 54A05; 54A99; 54H05text