Use Case Diagram Customers Suppliers Manufacturers. When the decline is rapid the product is abandoned. In order to accept and ship such a lot to moog a 100 inspection for the non conforming features or out of specification condition must be performed and any non conforming pieces removed.
New products with unique features may be introduced. For example instead of plain q for a disconnect switch or main circuit breaker it is qb for the disconnect switch fused or non fused and qa for the circuit breaker. The most important factor is the cost of production.
A motor starter or contactor is also qa as is a power transistor or thyristor.
Provide products services and information that add value for customers and other stakeholders lambert et al 1998. Products are well branded. There are other sub classes for q. Iec81346 2 includes a group of optional tables in case you wish to use the 2 letter classification.