1. The idea
1.1 Graphical representation of a program
1.2 A flat view ?
1.3 A dead end
1.4 Cheating ?
1.4.1 Adding functionality
1.4.2 Object orientation
1.4.3 Fiddling with function pointers
1.5 Context oriented programming
1.5.1 Sharing information within a level
1.5.2 Calling a function from a lower level
1.5.3 Definition of a level or a tree
2. Building blocks
3. Reusing modules in different context
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1.5.1 Sharing information within a level

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