Revision with unchanged content. Transition from adolescence to adulthood is a critical stage in an individual's lifespan. Adolescents who lack adequate access to factual, affordable, confidential and friendly sexual health information and services may have unmet sexual and reproductive health needs that affect their health. This book examines factors that influence provision, access and use of adolescents' reproductive health services. The work is based on empirical study conducted among in-school adolescents in Central Kenya. It focuses on adolescents sexual health concerns and identifies policy, institutional, structural, ethical, and communication barriers that contribute to health services gap in provision, availability, access and use of adolescents' preventive reproductive health services. The book is addressed to professionals in public health including researchers in adolescent health and development, researchers in medical sociology and anthropology, health providers, health educators, guidance and counselling teachers and social workers.