Managing Uncertainty in Requirements: A Survey in Documentation-Driven and Agile Companies. - Alberto Sillitti; Martina Ceschi; Barbara Russo; Giancarlo Succi (IEEE METRICS, 2005)

Project Management in Plan-Based and Agile Companies. - Martina Ceschi; Alberto Sillitti; Giancarlo Succi; Stefano De Panfilis (IEEE Softw., 2005)