This document provides an in-depth understanding of child and young person development. It explains the sequence and rate of development, the difference between sequence and rate, and the influence of personal and external factors. It also discusses theories of development and frameworks for supporting development. Additionally, it covers methods for monitoring development, reasons for deviations from expected patterns, the impact of disabilities on development, and interventions for promoting positive outcomes. The importance of early identification of speech, language, and communication delays and disorders is analyzed, along with the role of multi-agency teams in supporting development. The document also explores how play and activities can support speech, language, and communication development, and the effects of different types of transitions on development.