LST is a three-year intervention designed to prevent or reduce gateway drug use (i.e., tobacco, alcohol, and marijuana), primarily implemented in school classrooms by school teachers. The program is delivered in 15 sessions in year one, 10 sessions in year two, and 5 sessions in year three. Sessions, which last an average of 45 minutes, can be delivered once a week or as an intensive mini-course. The program consists of three major components which teach students (1) general self-management skills, (2) social skills, and (3) information and skills specifically related to drug use. Skills are taught using training techniques such as instruction, demonstration, feedback, reinforcement, and practice.