Hello and welcome to the Institute for Social Science Research (ISSR) at the University of Massachusetts, Amherst. home methodology the branch of philosophy concerned with the science of method and procedure methodology the philosophical evaluation of investigative techniques. Single system designs (SSDs), otherwise known as single subject, single case, or N of 1 designs, are research formats that permit uncontrolled program evaluation and. RC president Ira Katznelson issues a statement on the Social Science Research Councils commitment to protecting and advancing rigorous. On Values and Action. ISSR, our mission is to promote excellence in.