This document provides an overview of the concept of social diagnosis in transactional analysis. It explains that people often respond to different ego states from their own. For example, someone may respond from their child ego state if approached from a parent ego state. Noting the ego state others respond from can provide insight into the ego state being used. The document suggests that if people seem to respond as children, the person may be addressing them as a controlling parent. It recommends experimenting with adult behaviors to change dynamics. Activities are included to reflect on recent social interactions and ego state responses.