Can complex conventional programs be revitalized?

摘要

The paper describes a knowledge-based front end for a mathematical simulation program CHEMSIM that has become outdated because of the evolution of interface techniques. Reimplementation is out of the question because of the program's complexity. The front end helps the user with its data entry.The task model and user characteristics specified the functional description. A hierarchical task tree models the domain knowledge and user interface. A free walk through the parameters is guided by graphical representation and known technical graphics. The front end takes care of consistency and the inter-connections of parameters, offers context dependent help, and gives feedback on the user's progress.Reusability was one important objective during the development phases.