Introduction to the topic of Human lifespan development - BTEC Health and Social care. Work booklet . Part 1 of a series of 6. INTRODUCTION Work booklets arranged by life stage. This series of work booklets cover each life stage allowing learners to work on a range of tasks. The booklet includes a variety of activities to allow learners to work either teacher led or independently. Part of a series of 6. It covers Physical, Intellectual, Emotional and Social Development in all life stages. Introduction to Human Lifespan Development. Infancy Childhood Adolescence Adulthood Factors affecting Development