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Date:	Fri, 4 Sep 2015 07:02:43 -0700
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Subject:	Re: [geda-user] Interesting blog post from a commercial EDA vendor - pdf
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On Fri, Sep 4, 2015 at 12:19 AM, Bert Timmerman (bert DOT timmerman AT xs4all DOT nl)
[via geda-user AT delorie DOT com] <geda-user AT delorie DOT com> wrote:

>
> I have a couple of gigabytes of datasheets lingering in a Network Archive
> Storage as well ;-)
>
> All sorted by vendor and part ID.
>
> And some (most) are old revisions, so called "uncontrolled copies".
>
>
> Kind regards,
>
> Bert Timmerman.
>
>
The number one rule for effective design-for-reuse is to NEVER copy data in
a database. Everything is assigned to one particular location and
any one who needs that data gets it from that location. If you start making
copies and passing them along then you lose the link back to the
original designer. Bug fixes get passed down stream but are never passed up
stream to be passed on to all the users. The design starts to
fragment and go viral.

Eventually someone tries to build a design using components with two
slightly different variants of a component and you have a train wreck.


John Eaton

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<div dir=3D"ltr"><br><div class=3D"gmail_extra"><br><div class=3D"gmail_quo=
te">On Fri, Sep 4, 2015 at 12:19 AM, Bert Timmerman (<a href=3D"mailto:bert=
.timmerman AT xs4all DOT nl">bert DOT timmerman AT xs4all DOT nl</a>) [via <a href=3D"mailto:=
geda-user AT delorie DOT com">geda-user AT delorie DOT com</a>] <span dir=3D"ltr">&lt;<a =
href=3D"mailto:geda-user AT delorie DOT com" target=3D"_blank">geda-user AT delorie DOT c=
om</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"marg=
in:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><br>
I have a couple of gigabytes of datasheets lingering in a Network Archive S=
torage as well ;-)<br>
<br>
All sorted by vendor and part ID.<br>
<br>
And some (most) are old revisions, so called &quot;uncontrolled copies&quot=
;.<br>
<br>
<br>
Kind regards,<br>
<br>
Bert Timmerman.<br>
<br>
</blockquote></div><br></div><div class=3D"gmail_extra">The number one rule=
 for effective design-for-reuse is to NEVER copy data in a database. Everyt=
hing is assigned to one particular location and<br></div><div class=3D"gmai=
l_extra">any one who needs that data gets it from that location. If you sta=
rt making copies and passing them along then you lose the link back to the<=
br></div><div class=3D"gmail_extra">original designer. Bug fixes get passed=
 down stream but are never passed up stream to be passed on to all the user=
s. The design starts to <br></div><div class=3D"gmail_extra">fragment and g=
o viral. <br><br></div><div class=3D"gmail_extra">Eventually someone tries =
to build a design using components with two slightly different variants of =
a component and you have a train wreck.<br><br><br></div><div class=3D"gmai=
l_extra">John Eaton<br><br><br></div><div class=3D"gmail_extra"><br><br><br=
></div><div class=3D"gmail_extra"><br><br></div></div>

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