- Labels – for nodes and arrows must be short expressive text, representing the knowledge, you can also use symbols i.e. +; %.
- Arrows – connecting nodes are directed from a general concept node to the nodes that show details of concepts.
- Drawings / symbols / codes / images – nodes labels can be accompanied by meaningful drawings to increase visual impact and create links between knowledge.
- Colours – are used to group nodes with the same element on a branch.
- The tree structure – should group nodes with the element.
