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Coding
Testing
Maintenance
100
Cost of repair
Cost of Repair
x1
x4
x16
Project Duration (Months)
cost of repair multiplies on the time scale
FIGURE 19.3
Cost of repair increase estimated against development time scale (Quality
Management and Assessment).
4
In model-based design testing, an integrated development process will enhance
and simplify the procedures on multiple levels. Because model-based design lends
itself to modularization of components using serial systems, parallel systems, and
subsystems, testing can begin near the beginning of the design process as opposed to
a postintegration phase such as in legacy testing paradigms. Component- and system-
level software and hardware testing can be increased, and testing can begin at earlier
stages in the design. Testing additionally can occur with more concurrency as a result
of the modular nature of the newer design paradigms, decreasing the time to market
via a parallel/pipeline type of approach. As indicated in Figure 19.3, changes and
improvements made later in the design process are far more costly than those made
in the earlier stages.
Validation and verification procedures are a certain means of improving product
quality and customer satisfaction. By applying such procedures at every step of
development, an enormous cost savings can be realized by iterating improvements at
the earliest possible stage of the development, when integration is considerably less
complex.
19.4
VALIDATION AND VERIFICATION METHODS
Model-Based development/design has become a standard engineering industry op-
erating procedure in computer aided design (CAD) and computer-aided engineering
(CAE). There are several proven capable and trusted tools for graphical modeling and
4
Quality Management and Assessment: Renate Stuecka, Telelogic Deutschland GmbH Otto-Brenner-
Strasse 247, 33604 Bielefeld, Germany http://download.telelogic.com/download/paper/
qualitymanagement.pdf.
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