This issue contains a selected group Qf papers presented during the International Workshop on Categorical Topology held from August 31 - September 4, 1994 at the University of L' Aquila, L' Aquila, Italy. The workshop was organized by the Department of Pure and Applied Mathe- matics of the University of L' Aquila and was made possible by grants from the Department, the University, the Regione Abruzzo and the Cassa Di Risparmio della Provincia de l' Aquila. We wish to thank the officers of the University and public local administrations who facilitated the financial supports. We would also...