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# Constructional Relations

Constructional relations are relations between geometrical objects and parameters which are defined by pre-determined constructional rules.
For this purpose SISCAD-P distinguishes between

- constructing objects and
- constructed objects.

Constructing objects are those objects which are taken for the construction of one or more objects.
Constructed objects are those objects which are created during a construction with the help of other objects.
Constructional relations are a powerful tool for the creation of variant constructions. This tool has to be carefully used, because the manipulation of the geometrical objects which have been saved for constructional relations is restricted.

- Meaning of Constructional Relations
- Typical Applications
- Working with Constructional Relations
  - Save
  - Untie
  - Later Saving of Constructional Relations
  - Inform
- Limits of Constructional Relations