The document discusses concept maps and mind maps and how they can be used to revise science concepts. It provides details on what concept maps and mind maps are, how they differ, and steps to create a concept map using the topic of living things as an example. Key points include that concept maps show relationships between concepts in a hierarchical structure while mind maps are more free form, and constructing a concept map involves identifying main concepts and linking related sub-concepts with phrases to show their relationships.