THRIVE Study: Positive Affect Training for Endocrine Therapy Medication Adherence

Inclusion Criteria: * hormone receptor-positive breast cancer stages 0-3 * have finished primary treatment (chemotherapy/radiation/surgery) * are prescribed endocrine therapy (ET) currently or within the last two years * score above specified cut off (range, 0-10) on any of three questions: 1. How upset are you by having to take anti-hormonal therapy 2. How bothered are you by the side effects? 3. How difficult is it for you to take your anti-hormonal medication every day? * have internet access to complete online assessments and intervention components or agree to use and return a study wifi-activated iPad. Exclusion Criteria: * metastatic disease * Individuals who are unable to interact with the intervention as needed. This includes those who are extremely visually impaired to the degree that they cannot see the screen and interact as required and individuals who cannot read and/or write in English. This is due to the nature of the intervention itself. If a participant is unable to interact with THRIVE as required, they are unlikely to benefit from the intervention or offer insightful feedback that can be used in refining the program.