1. Methodische Schritte beim Klären konstruktiver Aufgabenstellungen. Konstruktion 27;Franke,1975
2. Engineering Design—A Systematic Approach;Pahl,1999
3. Managing Requirements or Being Managed by Requirements—Results of an Empirical Study;Schmidt-Kretschmer,2007
4. Some Guidelines for the Development of Performance Specifications in Product Design;Roozenburg,1991
5. Specifications in Early Conceptual Design Work;Hansen,2007