 By this time, the popularity of DOS based programs was in decline and in addition, Ability Plus suffered from the lack of development investment in the period following the launch of version 1.0 (almost no development took place from 1988 to 1991).Ability was originally developed by a team all of whom came from the University of Waterloo, Ontario, Canada.By the time of Ability Plus, the majority of the code was in C with a small amount of assembly.