This document summarizes a presentation on assessing adherence to HIV treatment. It defines adherence to care and treatment, describes various methods to measure adherence including patient recall, pill counts, and qualitative assessments. Program examples from Swaziland, South Africa, and Mozambique are provided. Visual, qualitative, and partnership-based approaches aim to facilitate patient understanding and ongoing monitoring to support optimal adherence. Barriers to and facilitators of adherence are identified to guide interventions.