Use of antiretroviral therapy (ART) increasing in Sub Saharan Africa has offered hope to HIV-infected patients. HIV treatment success depends on continuous high levels of adherence (> 90-95%), proven a major problem among many ART users. To support adherence, its important to understand causes of non-adherence & use reliable tool to measure adherence, both aspects are limited in low resource countries. This book identifies reliable and valid tools to measure adherence and contributes to improved understanding of challenges patients face when taking ART. Studies were conducted to examine...