Recent research in the area of masculine and feminine personality characteristics has led to conflicting results about the adaptive value of androgyny. To investigate the relationship between sex-typing and self-reported job satisfaction and performance in the male-dominated field of engineering, 346 male and 346 female engineers completed the instrumental and expressive scales of the Personal Attributes Questionnaire as well as an extensive survey and interest inventory. The androgynous and masculine sex-typed groups reported significantly higher levels of job performance, job satisfaction and self concept of abilities than the feminine sex-typed and undifferentiated groups, regardless of sex. The androgynous group was not significantly different from the masculine group on job performance or self concept. Females tended to have more favorable attitudes towards women in engineering, regardless of sex-type. Results indicate that the presence of instrumental traits is related to higher levels of self-reported job performance and satisfaction in engineering. (Author/JAC)