In a review of instruments measuring gender-related constructs, a number of shortcomings were found in existing scales. A new scale to measure sex-role attitudes was developed and tested by first proposing the construct of sex-role egalitarianism and then initiating the process of construct validation by developing a reliable measure of the construct. Sex-role egalitarianism was defined as an attitude which causes a person to respond to another individual independently of that other individual's sex. Five domains in which the attitude would manifest itself were specified: marital roles, parental roles, employment roles, social-interpersonal-heterosexual roles, and educational roles. College students' responses were used to reduce the initial 520 items to two 95-item parallel scales. Data obtained from the administration of the resulting Sex Role Egalitarianism Scale to other college students (N=252), senior citizens (N=59), and police officers (N=56) indicated acceptable coefficients of stability, equivalence, and internal consistency. The pattern of mean scores demonstrated support for the construct's validity. Findings suggest that the scale has potential research value as a paper-and-pencil measure of sex-role egalitarianism. (NRB)