During the past two years, the Waterloo Foundation for the Advancement of Computing (WATFAC) and the University of Waterloo have been developing educational software in a number of projects using DEC PDP-II mini-computers. These projects include the development of WATFOR-II (a load-and-go FORTRAN compiler), WATBOL-II (a load-and-go COBOL compiler), and WIDJET Ca student editing and job-entry system). This paper presents a survey of these projects and discusses several problems encountered during their implementation.