Hi Dave and All,

        A really basic question, what is your big picture?
        Why are you collecting the data?
        What is done with the data once it is collected?

        How you count defects should depend on what you want to do with the
data.

        If you want an idea of how many boards to schedule through the shop
you want an overall yield.
                I schedule 100 boards to get 75 out to the Assembly shop and
end up with 70 going to the customer.
                This would also give you an idea of whether you will make
that production deadline with or without overtime, ordering more materials,
etc.

        If you are more interested in knowing how well you make boards you
can count # defects per board and the kinds of defects seen.  Hopefully,
somebody uses that info to make process improvements.

        Hans

Air Force Material Command - We keep them flying!
~~~~~~~~
Hans M. Hinners                                 WR-ALC/LYPME Bldg. 640
Materials Engineer                                      380 Second Street,
Suite 104
Manufacturing Eng. Sec.                         Robins AFB GA 31098-1638
912-926-1970 (Voice) 468 - 1970 (DSN)   912-926-7974 (Fax)
[log in to unmask]



> Technetter's,
>
> When reporting defects, do I count all defects individually or do I count
> the number of bad circuits.  For example, if I have a circuit which
> contains 3 defects, do I count this as 3 (for the 3 defects) or 1 (for the
> single, bad circuit).
>
> Thanks in advance for the clarification.
>
> Dave Roesler
> TRI-C Design, Inc.
>
> ##############################################################
> TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c
> ##############################################################
> To subscribe/unsubscribe, send a message to [log in to unmask] with
> following text in
> the body:
> To subscribe:   SUBSCRIBE TECHNET <your full name>
> To unsubscribe:   SIGNOFF TECHNET
> ##############################################################
> Please visit IPC web site (http://www.ipc.org/html/forum.htm) for
> additional
> information.
> If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or
> 847-509-9700 ext.5365
> ##############################################################

##############################################################
TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c
##############################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in
the body:
To subscribe:   SUBSCRIBE TECHNET <your full name>
To unsubscribe:   SIGNOFF TECHNET
##############################################################
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
information.
If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or
847-509-9700 ext.5365
##############################################################