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A new methodology for communicating engineering information called Model Based De nition is gaining popularity. In this article a comparison will be made of the socalled traditional way that engineers communicate their ideas using engineering drawings, where the drawing is the authority, and this new Model Based De nition methodology, where the 3D model is the authority. The pros and cons of implementing Model Based De nition are critically analysed. The conclusions drawn from this analysis indicate where further development is needed if Model Based De nition is to become more widely accepted.

The Current State of Model Based Definition