Stacked Deck: A Program To Prevent Problem Gambling is a school-based prevention program that provides information about the myths and realities of gambling and guidance on making good choices, with the objective of modifying attitudes, beliefs, and ultimately gambling behavior. The intervention is provided to students in 9th through 12th grade as part of a regularly scheduled class such as health education or career management. Trained facilitators (teachers, prevention specialists, or health educators) use a facilitator’s guide to administer five 50- to 90-minute interactive lessons over a period of 2 to 3 weeks.