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evaluating software architectures, all of which were developed at the
Software Engineering Institute with involvement by the authors. The
methods examined are:
(1) ATAM (Architecture Tradeoff Analysis
Method)
(2) SAAM (Software Architecture Analysis Method)
(3)
ARID (Active Reviews for Intermediate Designs)
Each of the above
address software evaluations in increasing levels of detail, with the
book's main emphasis on ATAM.
What makes this book so valuable is
the fact that you can learn much about developing software
architectures from the criteria with which they are evaluated. For
example, the discussion on quality attributes is eye-opening because
what architects consider to be well formed quality attributes are
usually too vague to properly evaluate, resulting in ill defined
architectures in the first place. Knowing how to evaluate the
architecture will provide the keys for defining a solid architecture.
More important is the way the authors define the outputs of the
architecture evaluation, which gives the practicing architect a
framework for design that fully meets the evaluation criteria. The
net result is that a defined architecture will unambiguously
communicate the design to the development team, as well as to the QA
team.
I especially like the business oriented approach that
addresses the costs and benefits of evaluation, the three approaches
from which to choose that best meets technical and business goals, and
the case studies that support each of the approaches. Another strong
point about this book is architecture is also evaluated with
production in mind. Too many books only consider architecture from
the development point of view, or in rare cases, from development and
QA points of view. The evaluation techniques in this book extend to
support and maintenance. The authors make selection of the best
technique easy by comparing them in Chapter 9, and provide an approach
to implement evaluations in Chapter 10.
If you're an architect I also recommend augmenting the excellent
material in this book with Design and Use of Software Architectures by
Jan Bosch , which gives an alternate method to ATAM that is more
complete in many respects. Even if you espouse Bosch's approach,
however, the approach and techniques given in Evaluating Software
Architectures: Methods and Case Studies are complementary. I personally
recommend both books and assign equal value to them.
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This dialectic underlies much of The Everlasting Sky. And even that trivial insight is not key to understanding or experiencing the dazzling Anishinabe voices under Vizenor's pen. Perhaps it is necessary to allow oneself to experience the pain in it, even vicariously, to progress to something like a starting point, or common ground. Then the elusive beauty that pervades the underlying cultural vision can perhaps be glimpsed or imagined.
Though it is difficult to understand those whom we have so badly hurt, it is not a punishment to read The Everlasting Sky. Rather, it is an experience of richness, like the final series of paintings of George Morrison, that work to "create a sense of that imagic moment when the water on the horizon of the lake merges with the sky (p. x)."
Nancy Lorraine, Reviewer
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