Although the importance of addressing and evaluating treatment and program fidelity is clearly emphasized in the literature on psychology, education, and health, little attention has been given to fidelity in adventure literature or research. Program fidelity refers to whether or not, and how well, a specific intervention or program was implemented as planned. This article provides a background on fidelity, including program adherence and competence, factors that affect fidelity, and ways that adventure practitioners as well as evaluators can be intentional in addressing and measuring fidelity in adventure programming and research. (Contains 1 table.)