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A diagram is a simplified and structured visual representation of concepts, ideas, constructions, relations, statistical data, anatomy etc used in all aspects of human activities to visualize and clarify the topic.
Basic diagram types: - Tree - Graph - Matrix - Network - Flow
Specific types: - IDEF0 - IDEF1 (Entity Relations) - Nassi Scheidermann - Jackson - Organisation - Ishikawa - Gantt - Pert - Petri Net - Process - Mind Maps - Condition - Histogram - Rich Pictures - Value Stream Mapping - Systematic Layout Planning - Line of Ballance - Nomogram