Dear all A brief question if I may. We are looking for papers that deal with the minimum number of units that need to be allocated in an RCT, where the unit of analysis is the school (or classroom) and not the individual. Please do send us any paper, book chapter (or citation) relevant to this mater. Sincerely, maria -- Dr Maria M. Ttofi Leverhulme and Newton Trust Fellow Post-doctoral Researcher Institute of Criminology University of Cambridge email: [log in to unmask] Office No: 01223 767186 http://www.crim.cam.ac.uk/people/acadbiog.html?recordID=199 You may leave the list at any time by sending the command SIGNOFF allstat to [log in to unmask], leaving the subject line blank.