1. Software Engineering Principles and Methods;Ratcliff,1987
2. Systems Development: Requirements, Evaluation, Design, and Implementation;Jordan,1990
3. Data definitions-deliverable 13;Ross;SWDL/9WDL/COLL/DEFS/ISSI, UKAEA,1987
4. The relationship between specification and implementation metrics;Samson,1989
5. A comparison of cost estimation tools;Rubin,1985