A test of problem solving behavior which provides information about the mastery of the prerequisites of the problems has been developed for fourth grade children. Each problem solving question is preceded by two other questions which assess the child's understanding of the information contained in the actual question, and an application question which measures the child's knowledge of an underlying concept of the problem solving question. The study is concerned with determining whether asking multiple questions about the same unit of information affects the response to those questions, and with measuring the extent to which the questions preceding the problem solving question assess prerequisites of it. The test was administered to 600 fourth grade students in Wisconsin and the resulting data are presented. Various types of item analysis are described; reliability and content validity of the test are reported. A copy of The Problem Solving Test is appended. (Author/MV)