Prototyping as a tool in the specification of user requirements

One o f the major p rob lems In deve lop ing new computer app l i ca t ions i s spec i fy ing the useres requ i rements such that the Requ i rements Spec i f i ca t ion I s cor rect~ complete and unambiguous. A l though prototyp lng I s o f ten cons idered too expensive, correct lng ambigu i t ies and misunders tand ings a t the spec i f i ca t ion s take i s s ign i f i cant ly cheaper than cor rect ing a sys tem a f ter I t has gone in to product ion.;h i s paper descr ibes how a prototype was used to he lp spec i fy the requ i rements o f a computer sys tem to manage and cont ro l a semiconductor process ing fac i l i ty. The cost of