A PhD dissertation by LaurieWilliams in August 2000 presented research results on CollaborativeSoftwareProcess (CSP). CSP is a process for pairs which added pair programming to PSP (PersonalSoftwareProcess), vs. individuals using PSP. A PDF of the dissertation can be found at http://collaboration.csc.ncsu.edu/laurie/Papers/dissertation.pdf.
See AgileAndTspDiscussion for related experiments blending XP with PSP/TSP.
-- KarenSmiley