PARTICIPATORY EVALUATION OF COMMUNITY-BASED WATER AND SANITATION PROGRAMS: THE CASE OF CENTRAL TANZANIA by ALOYCE R.M. KALIBA B.Sc, Sokoine University of Agriculture, 1989 M.S., Kansas State University, 1995 A DISSERTATION Submitted in Partial Fulfilment of the Requirements for the Degree DOCTOR OF PHILOSOPHY Department of Agricultural Economics College of Agriculture KANSAS STATE UNIVERSITY Manhattan, Kansas 2002 Approved by: Major Professor. David W. Norman