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   Re: [xml-dev] Web Services and Quality

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Regarding metrics and measurement: I'm going through the W3C Web
Services Architecture (W3C Working Draft 8 August 2003[1]) which
presents 5 "architectural models" - one of these models is the
"Management Model". This model includes the concept of "management
metrics". It states:

"The value of the metric captures the information at a point in time.
Generally these values are numeric, but may be strings as well. This can
be contrasted with Measurements that are calculated with a formula based
on metrics, e.g. Average response time during the last hour of
execution. The metrics requirements do not enforce any implementation
pattern. A managed element should allow any available metrics and
measurements to be reported according to configurable time intervals,
such as cumulative, sliding window, and interval. A managed element must
declare which interval types are supported."

So one potential criteria for rating a Web service could be (as the
example above suggests) average response time. This could be computed
dynamically and updated at regular intervals, according to an advertised
method (e.g. cumulative, sliding window, and interval - as in the
example above).

Kind Regards,
Joe Chiusano
Booz | Allen | Hamilton

[1] http://www.w3.org/TR/ws-arch/

Nicolas Toper wrote:
> the web have the same problem :=) if you find an answer you'll do better
> than google (which might be a part of the solutions)
> -----Message d'origine-----
> De : Chiusano Joseph [mailto:chiusano_joseph@bah.com]
> Envoye : mercredi 17 septembre 2003 17:51
> A : Simon St.Laurent
> Cc : xml-dev@lists.xml.org
> Objet : Re: [xml-dev] Web Services and Quality
> <Quote>
> Determining whose feedback to listen to, while still keeping consumers
> free of legal or other retailiation from vendors seems like a bigger
> problem than the technical issues.
> </Quote>
> Yes - it seems like there would need to be some sort of established and
> respected ratings service (much like Arbitron rates TV stations here in
> the US(?)). Another possibility is for an open standards consortium
> (such as OASIS) to, through a TC, establish a framework for Web Services
> rating with wide vendor participation. A large vendor backing would add
> further legitimacy to such a framework. Then, the framework could be
> adopted by a Web service and the various values provided by that Web
> service.
> Of course, that leads to the question of how to get Web service
> providers to honestly provide values for their services...
> Kind Regards,
> Joe Chiusano
> Booz | Allen | Hamilton
> "Simon St.Laurent" wrote:
> >
> > chiusano_joseph@bah.com (Chiusano Joseph) writes:
> > >Lately I've been thinking about what's around the corner for Web
> > >services (whether we're close to that corner yet or not is a separate
> > >issue). The notion of dynamic discovery and collaboration of Web
> > >services comes to mind (choreography, business processes, etc.) - but
> > >I'm also thinking in terms of how a Web service can judge the "quality"
> > >of another Web service. My question is: is anyone aware of any current
> > >efforts on rating Web services?
> >
> > I don't have a good answer for this, but have heard several suggestions
> > for providing EBay-like feedback on services using UDDI-like approaches.
> >
> > Determining whose feedback to listen to, while still keeping consumers
> > free of legal or other retailiation from vendors seems like a bigger
> > problem than the technical issues.
> >
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tel;work:(703) 902-6923
org:Booz | Allen | Hamilton;IT Digital Strategies Team
adr:;;8283 Greensboro Drive;McLean;VA;22012;
title:Senior Consultant
fn:Joseph M. Chiusano


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