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# System Concepts within SISCAD-P

The following concepts are valid throughout the system:

- WYSIWYG-Principle
- Draft Mode
- Intelligent Snap Mode
  - Snap Symbols
  - Temporary Extension Lines
- Dimensioning Concept
- Parametric Concept
  - Constructional Relations
  - Constraints
  - Variables-Functions-Formulae
- User Information
- Assembly Modeling
  - Parts
  - Master Data
  - Bill of Materials
- Form Features
- Title Blocks
- Drawing Frames