This approach is based on the existence of a
significant number of reusable components. The system development process
focuses on integrating these components into a system rather than developing
them from scratch.
fig: Reuse oriented development
The
Reuse-based development is based on the systematic reuse of systems where they
are integrated from existing components or COTS (Commercial-off-the-shelf)
systems. Therefore the final product is assembled using existing
components. It emerged from the failure of object-oriented development to support
effective reuse. Single object classes are too detailed and specific.
Components are more abstract than object classes and can be considered to be
stand-alone service providers.
Advantages
1.
Minimization of cost and
risk,
2.
Management of Complexity
3.
Reduce Development Time
4.
Increased Productivity
5.
Improved Quality
Disadvantages
1.
Development
of Components
2.
Lack of
Components
3.
Component
Maintenance Costs
4.
Reliability
and Sensitivity to changes
5.
Unsatisfied
Requirements- how do we trade-off analysis between the features of one component and another?
6.
Trust – how can a component with no available source
code be trusted?
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