This course explores how human development can be affected by various conditions across all stages of life, from infancy to older adulthood. Students will learn about developmental differences and challenges in pediatric, adolescent, adult, and geriatric populations, with a focus on understanding their impact and appropriate interventions. Building on the foundational knowledge from DPT 799: Motor Learning and Control I and DPT 800: Motor Learning and Control II, this course will deepen students’ understanding of atypical development, clinical outcomes, and treatment approaches. Students will explore alternative assessment and intervention strategies tailored to diverse patient needs, including special populations. A key focus of the course is learning how to assess movement, function, and participation using inclusive and widely accepted models, including the International Classification of Functioning, Disability, and Health (ICF) model and the task-oriented conceptual framework for intervention. Students will develop skills to identify impairments across multiple physiological systems and understand how they affect daily activities and participation in different life stages. By the end of the course, students will be equipped with the knowledge and practical strategies needed to evaluate and treat patient populations across the lifespan thought individualized assessment and intervention strategies.