| Concept | Documentation |
| receiving input through | Specifies the Input of a Functional Usage. |
| sending output through | Specifies the Output of a Functional Usage. |
| General Function Usage Exchange Point | Exchange point of functional usage. |
| General Functional Usage | Specifies a General Usage of a General Function within one or more other General Functions. |
| General Functional Exchange | Specifies the fact that an General Functional Exchange between General Function Usage Exchange Points Parameters is taking place. |
| appearing in | Specifies the fact that a Functional Exchange appears within a general Functiona Usage. |
| coming from | Specifies the fact that a General Functional Exchange is coming from a General Functional Usage Exchange Point. |
| going to | Specifies the fact that a General Functional Exchange is going to a General Functional Usage Exchange Point. |
| controlled after | Specifies a sequential execution of Functions. |
| General Function | Specifies a General Function. It is used as base Class for specific System or Context Functions, or Partial Functions. |