Discusses the Life Attitudes Schedule (LAS), a questionnaire administered to 1,539 high school students and young adults that measures suicidal and other risk-taking behaviors. Postulates a single domain of behaviors to which all life-threatening and life-enhancing behaviors belong. Supports a broad, bipolar conceptualization of suicidal and other risk-taking behavior that encompasses life-threatening and life-enhancing behaviors. (Author/KW)