Kumari Pooja Yadav, Saher Ansari, Abdur Raheem Khan2026-11-042026978-81-17296-08-0http://136.232.12.194:4000/handle/123456789/2328Book Title: Principles and Practice of Physiotherapy: Foundations, Assessment, and Modalities Book Author(s)/Editor(s): Dr. Abdur Raheem Khan, Dr. Ashfaque Khan, Dr. Minal FizaFunctional assessment and activity-based evaluation are important approaches for determining how a person's health condition influences movement, independence. daily activities, and participation. Traditional assessment often concentrates on impairments such as pain, weakness, restricted range of motion, reduced endurance, altered balance, or impaired coordination. Although these findings are clinically important, they do not always explain how a person performs meaningful activities in daily life. Functional assessment therefore focuses on the individual's ability to perform purposeful tasks, while activity-hased evaluation examines performance during specific activities such as walking, sit-to-stand, stair climbing, reaching, transferring, lifting, running, and other goal-related tasks. The International Classification of Functioning. Disability and Health (ICF) provides an appropriate framework for understanding the relationship between impairments, activity limitations, participation restrictions, and contextual factors. Standardized tools such as the Timed Up and Go Test, Five Times Sit-to Stand Test, Six Minute Walk Test, Berg Balance Scale, Functional Keach Test, Rarthel Index, Functional Independence Measure, Lower Extremity Functional Scale, and Patient-Specific Functional Scale can provide objective information about functional performance. Research has demonstrated useful reliability, validity, and responsiveness for several of these measures, although their measurement properties and clinical usefulness vary according to the population and purpose of assessment. A comprehensive evaluation should therefore combine clinical examination, observation of functional tasks, standardized outcome measures, and patient-defined activities.en-USFunctional assessmentactivity-based evaluationfunctional mobilityactivity limitationphysical functionBook chapter