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You start with a styling buck, and then you have engineering mules or engineering prototypes, usually based on a current car, then you have integration or verification prototypes which are the correct shape and have the new systems fitted, then you have confirmation prototypes or pre production prototypes and then you have accelerated build and then J1 (production) cars. Roughly speaking. The terminology is different for each car company, where i work we have about 8 phases of prototype build. Greglocock (talk) 23:08, 17 November 2009 (UTC)[reply]