The document discusses the teacher's role in evaluation. There are two types of evaluation - formal and informal. The most important reason for a teacher to evaluate children's work is to assess their progress and ensure lessons are meeting goals and objectives. Successful evaluation involves planning goals in advance, keeping goals in mind during activities, and using various tools to evaluate after activities while still considering goals. Planning is also discussed as an essential role and skill for teachers, with benefits like ensuring lessons are balanced, giving teachers confidence, and being a sign of professionalism. Principles of effective planning include having a clear aim, variety, and flexibility.