Introduction
CA Gen is a Computer Aided Software Engineering (CASE) application development environment marketed by CA Technologies. Gen was previously known as IEF (Information Engineering Facility), Composer by IEF, Composer, COOL:Gen, Advantage:Gen and AllFusion Gen.
The toolset originally supported the information engineering methodology developed by Clive Finkelstein, James Martin and others in the early 1980s.
You can learn more about history of the product here.
You will find original documentation of the product here.
Video below presents a high level and easy introduction to the CA Gen.