This pioneering book empowers doctors, nurses, social workers, physiotherapists and lawyers with a comprehensive understanding of the disability model and its practical application in their everyday practice. Social barriers from the complexities in both medicine and law can be substantial for people with impairments, ultimately leading to disability. The disability model can help identify how systems could disadvantage people with specific functional restrictions and what adjustments are reasonable. To understand the many factors that influence health, healthcare and social care professionals have three key tools at their disposal. - The medical model explains illnesses like cancer and heart disease. - The biopsychosocial model explains psychological and social impacts on wellness. - The disability model explains how impairments cause functional restrictions. Only the disability model can fully answer questions about capability in legal processes, benefits systems and functional life expectancy. This book offers a ground-breaking universal framework for disability assessment using a comprehensive, step-by-step approach.