Справочник Пользователя для IBM SG24-7368-00

®

SG24-7368-00

ISBN 0738485683

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.

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.