GOAL AND OBJECTIVES: The goal of this pilot Sequential Multiple Assignment Randomized Trial (SMART) is to inform the planning of a subsequent larger SMART to evaluate an adaptive internet-based stress management program that follows a stepped-care model for adults with a cardiovascular disease. The primary objectives are to examine the (a) feasibility of the SMART procedures and different combinations of the stress management program (recruitment, retention, and questionnaire completion rates, reach, and fidelity) and (b) acceptability of the combinations of the stress management program, including adapting the program for non-responders and assessing adherence, satisfaction, and stress management strategies learned. The secondary objective is to estimate the program's effect size to inform sample size calculations for a full-scale SMART.