Khaled,

The system I use is based on the company's drawing system. We have 'M' 
drawings for bought components, and 'FM' drawings for assemblies. So a 
typical PCB would have the drawing number M100001A, and the PCB assembly 
would be FM100002A. For each layer we take the numeric part of the drawing 
and add a 2 digit code so the top conductor would be 100001W1 (the filename 
for the gerber would be the same), bottom conductor W2 and so on. L1 & L2 
for legend, S1 & S2 for solder resist, P1 & P2 for solder paste. The set of 
files would then be compressed and have a filename like 100001I1.zip where 
I1 is the issue number.

Hope this makes some sense,
Regards
Dave Coaker
Circuit Design Engineer
GEC-Marconi Electro-optics

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