The following provides a link to a chapter (downloadable in pdf format) from a forthcoming book "Research-Based Reform in University Physics" to be edited by Edward F. Redish http://www.compadre.org/PER/document/ServeFile.cfm?ID=4990&DocID=241.

Crouch, C. H. [ccrouch1@swarthmore.edu], Watkins, J., Fagen, A. P., & Mazur, E. (2007). Peer Instruction: Engaging students one-on-one all at once. In E. F. Redish & P. Cooney (Eds.) Research based reform of university physics  (AAPT, 2007) Available online at http://per-central.org/per_reviews/media/volume1/PI-2007.pdf  Retrieved April 13, 2007. 

Related papers can be found at http://www.physics.umd.edu/perg/role/PIProbs and http://mazur-www.harvard.edu/education/educationmenu.php