I know how and where to add a new unit of measure (pounds, etc...) but based on what/how we do things, knowing a products weight is critical.  Even items that we order as ''Each'' like Motors have weights.  So we need to capture from the users an items (parts) weight when they enter a Bought Component and calculate a weight  from a ...

The method recommended by CWD is valid and doesn't require anything more than a calendar and watch, therefore no regulation or procedures.  I prefer to use a WIP registry, that is work in progress registry that consists of a part number mask and description.  It's a little more formal and you can have parallel part numbering until you ...

Note: I write comments and  explanations in brackets. First of all I have to say I would draw ''Data Model for a Part'' another way (comparing to drawn on ProductEngineering/plm_parts.htm).I'd draw an arrow from Vendor to Manufactured Part instead of arrow from Manufactured Part to Vendor. The same thing with a model on ...