Subject Domain (in DDC) Computer science, information & general works ♦ Computer programming, programs & data Abstract A couple of years ago when the term "object-oriented" was less popular, we found that we needed a language that had some of the object-oriented capabilities of C++, $KEE^{TM}(b),$ and Smalltalk. The languages that were available at that time ran only on special purpose hardware and were not practical for our development because of lack of capabilities. The language we developed had to support a combination of the features in the above languages without giving up the standard 3GL features of flow control, arrays, and string manipulation. From these requirements, a programming language called ADL was born. The acronym ADL stands for "Algorithm Description Language" because ADL's original application was for development of models comprised of cost and transportation algorithms. As ADL was enhanced, it became apparent that ADL could be used for modeling general physical systems by representing the systems with "classes", and "instances". Age Range 18 to 22 years ♦ above 22 year Educational Use Research Education Level UG and PG Learning Resource Type Article Publisher Date 1991-07-01 Publisher Place New York Journal ACM SIGPLAN OOPS Messenger (OOPS) Volume Number 2 Issue Number 1 Page Count 20 Starting Page 8 Ending Page 27