Psychometric techniques were used for the development of a theoretical
ly-based measure of constructs related to safer sexual activity. A pil
ot study and two studies using college student samples were conducted
to derive, retain, and validate scale items. The final 38-item scale i
s comprised of subscales measuring attitudes about safer sex, normativ
e beliefs, intention to try to practice safer sex, expectations about
the feasibility of safer sexual activity, perceived susceptibility to
HIV/AIDS, and substance use. Each subscale contributed to the predicti
on of critical theoretical constructs, accounting for about 40% of the
variance in. intention to try to practice safer sex and for about one
fifth of the variance in self-reported HIV risk behavior. The final s
cale, as well as each subscale, was characterized by internal reliabil
ity and both construct and predictive validity.