This investigation analyzed sex-related and age-related differences on spatial visualization tasks, reasoning tasks, and mathematical problem-solving tasks; and the effects instruction in visual thinking would have on these differences. Students in fifth grade, ninth grade, and in college, were tested before and after twelve weeks of instruction…

Non-commercial investigator-developed tests and other instruments to assess mathematical instruction, reported in journals, dissertations, and ERIC documents from 1974 through mid-1981, are listed. For approximately 90 instruments, information on content, format, sample, reliability, correlations, and validity is included, as well as references.…