This document provides information about social investigation (also called a psycho-social study) in social work. It discusses how social investigation aims to understand individuals and problems in their social context. The document outlines the key components of a social investigation, including gathering information about the client, their family and social environment, personality, efforts to address problems, and psychosocial development. It describes techniques for social investigation like interviews and observation. Formats for interview guides/schedules are also provided, with topics like personal, family, and medical history.