Service orientation is a paradigm that frames what you do.
Service-oriented
architecture (SOA) is a type of architecture
that results from applying service
orientation.
We have been applying service orientation to help organizations
consistently deliver sustainable business value, with increased agility
and
cost effectiveness, in line with changing business needs.
Through our work we have come to prioritize:
Business value over technical strategy
Strategic goals over project-specific benefits
Intrinsic interoperability over custom integration
Shared services over specific-purpose implementations
Flexibility over optimization
Evolutionary refinement over pursuit of initial perfection
That is, while we value the items on the right, we value the items on the left more.
Respect the social and power structure of
the organization.
Recognize that SOA ultimately demands
change on many levels.
The scope of SOA adoption can vary. Keep
efforts manageable
and within meaningful
boundaries.
Products and standards alone will neither
give you SOA nor apply
the service
orientation paradigm for you.
SOA can be realized through a variety of
technologies and standards.
Establish a uniform set of enterprise
standards and policies based
on industry,
de facto, and community standards.
Pursue uniformity on the outside while
allowing diversity on the inside.
Identify services through collaboration with
business and
technology stakeholders.
Maximize service usage by considering the
current and
future scope of utilization.
Verify that services satisfy business
requirements and goals.
Evolve services and their organization in
response to real use.
Separate the different aspects of a system
that change at different rates.
Reduce implicit dependencies and publish
all external dependencies to increase
robustness and reduce the impact of change.
At every level of abstraction, organize each
service around a cohesive
and manageable
unit of functionality.
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Ali Arsanjani Grady Booch Toufic Boubez Paul C. Brown David Chappell John deVadoss |
Thomas Erl Nicolai Josuttis Dirk Krafzig Mark Little Brian Loesgen Anne Thomas Manes |
Joe McKendrick Steve Ross-Talbot Stefan Tilkov Clemens Utschig-Utschig Herbjörn Wilhelmsen |