Large scale assessments of educational progress can be useful tools to judge the effectiveness of educational programs and assessments. This document contains papers presented at the research seminar on this topic held at the Western Australian Institute of Technology in November, 1984. It is the fifth in a series of publications of papers presented at the workshops on different topics. Three papers make up this document. The first, by Wayne Welch of the University of Minnesota, discusses the science aspects of the National Assessment of Educational Progress (NAEP) in the United States. The second, by Malcom Rosier of the Australian Council for Educational Research, discusses the Australian Educational Data Archives System and data-sets collected from the International Association for the Evaluation of Educational Achievement (IEA). The third, by Cassandra Nixon, of the Secondary Education Authority of Western Australia, discusses large scale assessment efforts specifically in Western Australia. (CW)