•W. Scacchi, Understanding the requirements for developing open source software systems, IEE Proceedings – Software, 149(1), 24-39, Feb 2002. (pdf) •W. Scacchi, Is open source software development faster,    better, and cheaper than software engineering?                   2nd Workshop on Open Source Software Engineering,            Orlando, FL, May 2002. (pdf) •A. Karrer and W. Scacchi, Meta-environments for software production, Advances in Software Engineering and Knowledge Engineering , D. Hurley (ed.), Volume 4,  37-70, 1995. (pdf)