D-AG0002 - Modularity of Web Services Architecture

Greetings,

	I took an action item on Thursday's call to act as champion for two
individual goals. This is the first to be posted. 

	The current text of the editor's draft reads:

"It is a goal of the Web Services Architecture Working Group to develop a
standard reference architecture for web services that provides modularity of
web services components, allowing for a level of granularity sufficient to
meet business goals."
	As we consider how best to achieve this goal, we need to ask
ourselves the following questions: 
a) is the proposed text above sufficiently clear, concise and intelligible
to serve its purpose? I believe that it is but I may be slightly biased,
since I wrote it. :)
b) what are the critical success factors that we need to achieve this goal?
This consideration should result in a hierarchy of CSFs, which at the lowest
level of reduction will become requirements.
	I would like to propose the following CSF analysis for this goal,
from an architectural viewpoint:
AG002 - It is a goal of the Web Services Architecture Working Group to
develop a standard reference architecture for web services that provides
modularity of web services components, allowing for a level of granularity
sufficient to meet business goals.
	Therefore, the web services architecture should:
	AC0021 - Provide conceptual clarity to allow developers to share
ideas and code
		AC0211 - Reduce complexity by decomposition of the
components's functionality and its position within the architecture.
		AC0212 - Ease development, testing, and maintenance by
providing a logical, easy to understand, and consistent organization 
			AC2121 - Decrease debugging time by localizing
errors due to design changes
		AC0213 - Allow the creation of generic rules, methods, and
procedures to aid in consistent development practices 
	AC0022 - Support object-oriented design principles by encouraging
encapsulation and information hiding by components of the architecture
		AC0221 - Encourage reuse by creating well-defined modules
that perform a particular task 
		AC0222 - Allow the creation and deployment of configurable
objects that the end user can tailor for different purposes in a standard
way.
	AC0023 - Provide for Increased flexibility and maintainability
because single components can be upgraded or replaced independently of
others
		AC0231 - Support a variety of end-user interface and
deployment environments by allowing standardized subsets and supersets
	It's incredibly difficult to visualize this when it's written in
text, but it's easy to understand if you look at the attached diagram ( in
GIF format). The heirarchy of CSFs is reasonably clear. This is of course
only a partial list, and represents only my own thinking. Let's discuss this
and try to come to some consensus on the CSFs for this goal. Then we can
move on to the concrete requirements. 

Regards,

D-

 <<D-AG0002-CSF.gif>> 


***********************************************************************
Dr. Daniel Austin, Sr. Technical Architect
austin.d@ic.grainger.com (847) 793 5044
Visit: http://www.grainger.com

"Sapere Aude!"