I don't disagree with everyone who says left to right, top to bottom; and
since you have a NASA.GOV address I'm pretty sure they want it numbered
using this industry standard, and most software will do it for you this way
automatically...

BUT, I just want to add the radical statement that sometimes your assembly
and test people will appreciate you using a LITTLE common sense if there are
logical ways to number a PCB. For example, if your design has eight
identical channels across the top of the board, it may make sense to number
all of the components in the first channel before moving to the right and
numbering the next channel. Every board has unique characteristics but
finding a pattern is not too hard most of the time. Don't be afraid to use
good judgement to bend the rules a little if it makes life easier for all
concerned.

Just one opinion (and maybe why I don't do military anymore HAHA)
Jack

                -----Original Message-----
                From:   Hope Lariosa [mailto:[log in to unmask]]
                Sent:   Wednesday, October 20, 1999 9:09 AM
                Subject:        component numbering

                Is there a 'standard' on how to number components?

                I'm referring to the way reference designators for
components are placed.
                If people (engineer, designer, assembler, technician) want
to see a Right,
                Down method, would that apply to the schematic or the board?
If there is
                no stanrdard, I'm sure it all boils down to whatever the
people involved
                agree upon.

                I was wondering what the popular concensus is...anyone?