1. Handlungsspielraum, Mentale Repräsentation und Handlungsregulation am Beispiel der Mensch-Computer-Interaktion;Ackermann,1987
2. A quantitative approach to software management;AMI,1992
3. Application Prototyping: A Requirements Definition Strategy for the 80s;Boar,1984
4. Prototyping versus specifying: A multiproject experiment;Boehm;IEEE Transactions on SE,1981
5. Software Engineering Economics;Boehm,1981