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June 2016

DesignerCouncil@IPC.ORG

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From:
Nancy Jaster <[log in to unmask]>
Reply To:
(Designers Council Forum)
Date:
Thu, 9 Jun 2016 19:22:03 +0000
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All,



When I worked at Bell Labs we use to have "project notebooks".  It actually was a series of books that covered all aspects of the project.  The notebooks eventually went electronic but the intent was to have one place to capture all the design activity.  Notes, ideas that didn't work, open items etc.  The documentation didn't need to  be formal, but signed/initialed and date was a requirement.  The books were stored in one area so that all people working on the project could have access. When the project went to "production" the books transferred to the group that was taking care of the ongoing support.  That way they had the history and could add information as things changed.  Hope this helps in the conversation.





Nancy A Jaster

Manager, Design Process

IPC — Association Connecting Electronics Industries®

3000 Lakeside Drive, Suite 105N

Bannockburn, IL 60015  USA 

+1 847-597-2856 tel

+1 847-615-5638 fax

+1 847-615-7100 (Main)







-----Original Message-----

From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of Robert Wolfe

Sent: Thursday, June 9, 2016 2:14 PM

To: DesignerCouncil <[log in to unmask]>

Subject: Re: [DC] Design knowledge and experience capture?



After re-reading the question. I think most of the design intent really can be captured In document form as a design specification, along with design templates that have all the constraints set up & documented.

Also having design standards defined. If that next designer 5 years later has to touch a design and if all of the above was adhered to then they need to become familiar with all of the above prior to changing a design.

Some of our customers have complete design specs, and like Scott mentions templates for designs that are all set up, also the customer's CAD library must also be used.

So one would need to become familiar with all of that.



I was saying that there are also things to consider that are really in a grey area of what you would call design intent that can be done in a design that can cause problems down the road too.





-----Original Message-----

From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of Brooks, William

Sent: Thursday, June 09, 2016 12:00 PM

To: [log in to unmask]

Subject: [DC] Design knowledge and experience capture?



I've seen a need and desire to address an age old challenge in the design and manufacturing of electrical and electromechanical machines and circuits.

This is mainly regarding the capture of the experience and knowledge of the designer so that future edits to the design are not done in a way that inadvertently compromises the integrity of the design and creates issues with an existing product that were not issues before.



Many of you I'm sure, have experienced making changes to an existing design that is in production. Typically there is a need to change something due to an obsolete or discontinued part. Someone completely unfamiliar with the design may make assumptions about it from looking at the schematic and the board and not actually see all the potential impacts from making a simple change to the layout or circuit.



Many of the circuits we create have an integral relationship to the function of the circuit... Parts placement, arrangement, circuit trace widths and proximity to other traces or circuit groups, trace widths, thermal vias, stitch vias between planes, proximity of components, sensitive traces or components, high voltages and safety margins for spacing, diff pairs... etc. The list can be long...



Some of us add notes in the design to warn future designers, who will be asked to make changes in the circuit, of WHY the circuit is laid out the way it is...



I'm thinking that we need a better way to capture the knowledge and experience of the design intent and archive it with the design in such a way that if someone else needs to take it over they have all the knowledge they need to manage it at their fingertips. If you do this, how do you go about doing it in your organization?



Thanks,





William Brooks, CID+

Printed Circuit Designer

2747 Loker Ave West

Carlsbad, CA 92010-6603

760-930-7212

Fax:        760.918.8332

Mobile:    760.216.0170

E-mail:    [log in to unmask]







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