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# Constraints

Constraints either are relations between geometrical objects, which determine a geometrical condition of position, or between a dimensional object and geometrical objects, which determine a dimensional condition among the geometrical objects. No geometrical object is superior to another one, they are all equal.
In this section you will find the description of the constraints used in SISCAD-P.
Due to the constraints geometrical objects are restricted in their ability to be manipulated. For example: two finite lines have the relation to be parallel, so that they will remain parallel even after any later manipulation. Their distance or position to each other, however, can change.
In contrast to constructional relations constraints do not determine the objects ambiguously.
A measure for an object's ability to be manipulated is the degree of freedom what is described later.

- Constraints within SISCAD-P
- Degrees of Freedom
- Working with Constraints
  - Define
  - Delete
  - Inform
- Constraints and their Effects