The purpose of this study was to investigate the effects of an instructional program for nurses educating them to teach breast self-examination (BSE) to hospitalized patients. Nurses' knowledge, attitudes, self-practice, and practice of teaching breast self-examination to patients were measured in a group who attended such a program and compared with those of a control group who did not attend. The researchers found that the instructional program increased nurses' teaching of BSE to their patients, but did not affect their own self-practice. Nurses' attitudes to teaching BSE were less favorable than for self-practice. Issues related to environments for teaching BSE are discussed.