The purpose of this study is to develop a standardized decision support computer program (DSCP) (an expert system) with self-adaptation capabilities that can be used by nurses as an assessment support tool for dealing effectively with gender and ethnic differences in cancer pain experiences based on cancer patients' own views and experiences. The specific aims are to: a) collect data on cancer pain among four ethnic groups (Hispanic, non-Hispanic Whites, non-Hispanic African-American, and non-Hispanic Asian) in the U.S. and determine gender and ethnic differences in cancer pain experiences; and b) develop a DSCP based on these collected data and feedback from oncology nurses.