Re: [plcs] Updated slides on AP239ed2

[David Price <david.price@eurostep.com>]

On Monday 09 March 2009 08:18:51 Peter Bergström wrote:
> Dave,
>
> From where did you get the definition of a breakdown structure as being an
> "alternative structure of an original 'thing'"? I cannot recollect that as
> being the definition used in AP239.

See "Breakdown_of" entity type and the statements in the Introduction of the 
Product_breakdown module below:

These views are complementary to the assembly structure and bill of materials 
views that are the primary focus for manufacturing (realization) of a product 
[2]. Product breakdowns differ from such assembly structures in that the 
relationships between the nodes are often specific to both the particular 
breakdown and the product or products to which the breakdown applies. In the 
case of an assembly structure the meaning of the relationships between 
components is always a variant of the idea of assembly and so any sub-tree 
can be used in multiple assemblies. A similar sub-tree of a product breakdown 
can only be applicable to the breakdown of the product in which it is 
defined. The extent to which this is the case depends on the rule set 
followed by the creator of the breakdown.

>
> I also think your comment about interop between AP233 and AP239 (so if you
> need behaviour, use 233) deserves some afterthought: If that is true, whu
> do we need to include things into AP239 based only on the fact that it is
> part of AP233 and we want to be interoperable? Wouldn't that argument work
> for not including System as well?

I don't think so. System is *the* core concept, Behaviour is not. There will 
be almost zero interop with AP233 if AP239 doesn't include System.

>
>
> Peter
>
>
>
>
>
> -----Original Message-----
> From: David Price [mailto:david.price@eurostep.com]
> Sent: den 6 mars 2009 10:41
> To: plcs@lists.oasis-open.org
> Cc: Tim Turner; Rob Bodington
> Subject: Re: [plcs] Updated slides on AP239ed2
>
> The rationale for System in the modules themselves is based on the Systems
> Engineering discipline and its distinction between Systems and other
> configuration controlled items (i.e. a System or System of Systems is not a
> Part). Here's a link to the biggest industry group in the area and their
> definition of systems engineering:
>
> http://www.incose.org/practice/fellowsconsensus.aspx
>
> There are related ISO standards for SE processes:
>
> http://www.iso.org/iso/catalogue_detail?csnumber=27166
>
> Using a breakdown for these requirements didn't make sense because a
> breakdown is an alternative structure of an original "thing" (i.e. a change
> controlled view), but what SEs are building is the original "thing", not a
> view of it.
>
> Cheers,
> David
>
> P.S. WRT behavior not in AP239, I think one reason is that asset
> maintenance people don't repair or maintain the behaviour of a system so
> don't need that info or get it through a tech doc or similar. Not sure
> about that though. Either way, if you have a usage scenario where behaviour
> information needs to be exchanged, just use AP233 in conjunction with AP239
> as the aim is to support 100 percent interop between the two.
>
> On Thursday 05 March 2009 20:51:02 Tim Turner wrote:
> > Rob,
> >
> > I appreciate the update to the slides. Since the telecon was cancelled
> > today I would like to raise two points;
> >
> > 1. Could I suggest that you add a slide to inform about the things that
> > have been discussed and rejected (or that remain as low priority & hence
> > unlikely to be included in AP239ed2).
> >
> > In particular I think it worth stating that explicit subtypes for
> > various concepts (e.g. Failure, Failure mode, Failure mode effect,
> > Fault, Symptom, Behaviour etc.). This gives visibility that they have at
> > least been discussed with the relevant (current) conclusions as
> > presented.
> >
> > 2. On another note, I (& maybe others) could still do with a better
> > understanding of the reasoning behind the need for System and its
> > relationship to System_breakdown. In my mind, its inclusion would be
> > another reason to also include behaviour such that the behaviour of the
> > system can be specified (under certain stimulus).
> >
> > Regards,
> > Tim
> >
> >
> > ________________________________
> >
> > 	From: Rob Bodington [mailto:rob.bodington@eurostep.com]
> > 	Sent: 03 March 2009 11:59
> > 	To: plcs@lists.oasis-open.org
> > 	Subject: [plcs] Updated slides on AP239ed2
> >
> >
> >
> > 	Hi
> >
> > 	Here are an updated set of slides reporting on the status of
> > AP239 edition2 that were presented at the last PLCS TC telecom.
> >
> > 	These replace ISO 10303-239ed2_v005.ppt that was sent by Chris
> >
> > 	*	From: "Kreiler, Christopher G"
> > <Chris.Kreiler@ManTech.com>
> > 	*	To: <plcs@lists.oasis-open.org>
> > 	*	Date: Wed, 18 Feb 2009 10:40:47 -0500
> >
> > 	Regards
> > 	Rob
> >
> >
> > ------------------------------------------------------------------------
> > --------
> > 	Rob Bodington
> > 	Eurostep Limited
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