This report of the fourth British Columbia Mathematics Assessment conducted in May 1990 is a condensed form of the technical report of the evaluation project. The report is divided into five sections. An introduction provides the rationale and purpose of the project and describes the organization and scope of the assessment. The second section describes the findings about students' and teachers' opinions concerning issues related to the teaching and learning of mathematics. The third section discusses students' achievement in mathematics on a topic-by-topic basis. It describes students' performance by establishing four achievement categories for each grade level according to the percentage of students that are able to perform those mathematical skills. Mathematical skills and knowledge for each of the categories at the different grade levels are described. The fourth section consists of a more detailed discussion of students' achievement according the following five strands: number and operations, data analysis, geometry, measurement, and algebra. The final section presents conclusions and identifies four areas in which improvement is needed. The areas are: participation of women, implementation of the curriculum, teaching practices employed, and student outcomes. A "Highlights" section appears at the beginning of the document that identifies the questions addressed by the evaluation and a summary of the findings concerning students, teachers, students' achievement, and students' achievement on particular topics. Two appendices provide a description of the authors and several tables listing Review and Interpretation Panel members. (MDH)