Adjusting to XP: Observational Studies of Inexperienced Developers. - John Karn; Anthony J. Cowling; Sharifah Lailee Syed-Abdullah; Mike Holcombe (XP, 2005)

The Positive Affect of the XP Methodology. - Sharifah Lailee Syed-Abdullah; John Karn; Mike Holcombe; Anthony J. Cowling; Marian Gheorghe 001 (XP, 2005)

A follow up study of the effect of personality on the performance of software engineering teams. - John Karn; Tony Cowling (ISESE, 2006)