the acuc training system is composed of theory and practical training modules. students learn the theoretical aspects of the program directly from an acuc instructor supplemented with training manuals, handouts, presentations, and videos. practical training is provided in a pool or confined water environment by a certified acuc instructor. students are certified once they have completed a theory exam and practical evaluation. practical evaluations are performed in the open water by a certified acuc instructor. the number of dives required for practical evaluation and instructor-to-student ratios are based on the current acuc standard for the level of certification.