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SG24-7368-00 ISBN 0738485683
INTERNATIONAL
TECHNICAL
SUPPORT
ORGANIZATION
BUILDING TECHNICAL
INFORMATION BASED ON
PRACTICAL EXPERIENCE
IBM Redbooks are developed by
the IBM International Technical
Support Organization. Experts
from IBM, Customers and
Partners from around the world
create timely technical
information based on realistic
scenarios. Specific
recommendations are provided
to help you implement IT
solutions more effectively in
your environment.
For more information:
ibm.com/redbooks
Model Driven Systems
Development with
Rational Products
Understanding
context
Understanding
collaborations
Understanding
distribution of
responsibilities
This IBM Redbooks publication describes the basic principles of the
Rational Unified Process for Systems Engineering, which is IBM
Rational’s instantiation of model-driven systems development (MDSD).
MDSD consists of a set of transformations that progressively refine
knowledge, requirements, and design of complex systems. MDSD
begins with activities and artifacts meant to promote an understanding
of the system's context.
Requirements problems often arise from a lack of understanding of
context, which, in MDSD, means understanding the interaction of the
system with entities external to it (actors), understanding the services
required of the system, and understanding what gets exchanged
between the system and its actors. Managing context explicitly means
being aware of the shifts in context as you go from one model or
decomposition level to the next.
MDSD suggests that a breadth-first collaboration based approach
across multiple viewpoints is more effective than a traditional
depth-first functional decomposition in creating an architecture that
will not only meet requirements, but will prove to be more resilient in
the face of inevitable change. MDSD also seeks to provide an effective
distribution of responsibilities across resources. Joint realization and
abstractions such as localities provide an effective and elegant way of
accomplishing this.
Finally, the ability to attach attributes and values to modeling entities
and the parametric capabilities of SysML provide a basis for doing
simulations or other models to meet cost, risk, and other concerns.
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