While research is essential if change in the status and quality of life of women is to be achieved, no amount of research will benefit women if the research itself is sex-biased or sexist. The position taken in this document is that: (a) a lack of awareness of the issues and factors involved is primarily responsible for sexist biases in research; (b) the persistence of sex bias in psychological research is largely unintentional sexism; (c) research so influenced is unscientific; and (d) given the implications of such research for women in particular -in terms of equal opportunity, quality of life, and psychological health -the support, conduct, and publication of scx-biascd research is unethical.Possible sources of sexist bias at all stages of the research process are described. Review of background literature, formulation of the research question, research design, sample selection, dependent variables, statistical analyses, reporting of results, and interpretation of findings arc considered. The first part of the paper describes problems that may be encountered at each stage, describes the principles of nonsexist research, and reviews the literature in the area. The second part of the paper is a checklist which consists of specific questions that can be used to evaluate individual studies or projects.