Select service system solutions from
Alternative solutions and their
relative merits are considered in advance of selecting a
solution. Key requirements, design issues, and constraints are
established for use in alternative solution analysis.
Architectural features that provide a foundation for service
system improvement and evolution are considered.
Refer to the Decision
Analysis and Resolution process area for more information
about analyzing possible decisions using a formal evaluation
formal evaluation process that evaluates identified
alternatives against established criteria.
A potentially ineffective approach
to implementing this practice is to generate solutions that
are based on only the way services have been delivered in the
past. It is important to consider alternatives that represent
different ways of allocating and performing necessary
functions (e.g., manual vs. automated processes, end user vs.
service delivery personnel responsibilities, prescheduled vs.
on-the-fly service request management).
Components of the service system,
including service delivery and support functions, may be
allocated to external suppliers. As a result, prospective
supplier agreements are investigated. The use of externally
supplied components is considered relative to cost, schedule,
performance, and risk. Externally supplied alternatives may be
used with or without modification. Sometimes such items may
require modifications to aspects such as interfaces or a
customization of some of their features to better meet service
or service system requirements.
Refer to the Supplier
Agreement Management process area for more information
about managing the acquisition of products and services from
- Alternative solution screening
- Service system component
selection decisions and rationale
- Documented relationships between
requirements and service system components
- Documented solutions,
evaluations, and rationale
- Establish defined criteria for
- Develop alternative
- Select the service system
solutions that best satisfy the criteria
Selecting service system
solutions that best satisfy the criteria is the basis for
allocating requirements to the different aspects of the
service system. Lower level requirements are generated from
the selected alternative and used to develop the design of
service system components. Interface requirements among
service system components are described (primarily