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Authors: Barry Boehm, Dan Port, Marwan Abi-Antoun, and Alexander Egyed
Over our three years of developing digital
library products for the USC Libraries, we have been evolving an
approach called Model-Based (System) Architecting and Software
Engineering (MBASE). MBASE involves early reconciliation of a
project's success models, product models, process models, and
property models. It extends the previous spiral model in two ways:
- Initiating each spiral cycle with a
stakeholder win-win stage to determine a mutually satisfactory
(win-win) set of objectives, constraints, and alternatives for
the system's next elaboration during the cycle.
- Orienting the spiral cycles to
synchronize with a set of life cycle anchor points: Life Cycle
Objectives (LCO), Life Cycle Architecture (LCA), and Initial
Operational Capability (IOC).
The MBASE guidelines present the content
and the completion criteria for the LCO and LCA milestones (which
correspond to the Inception and Elaboration Phases of the Rational
Unified Process) of the following system definition elements:
- Operational Concept Description (OCD)
- System and Software Requirements
Definition (SSRD)
- System and Software Architecture
Description (SSAD)
- Life Cycle Plan (LCP)
- Feasibility Rationale Description (FRD)
- Risk-driven prototypes
The guidelines also include a suggested
domain taxonomy to be used as a checklist and organizing structure
for the WinWin requirements negotiation. The guidelines attempt to
achieve high conceptual integrity, little redundancy, and strong
traceability across the various system definition elements, and are
compatible with the Unified Modeling Language (UML). These
guidelines were used by 20 teams of 5-6 person teams of computer
science graduate students during Fall 1998, and were revised
following the LCO Architecture Review Boards. Another revision is
anticipated after the rebaselining of the LCA packages during Spring
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