Component-Based Software Engineering

GUI components are easy to reuse. In 1999 the market for GUI components was about $300 million dollars, mostly COM components. But the market for Java technology is growing.

BUSINESS CASE
Build Component cost = cost to build + cost to maintain components you build Purchase Component cost = Developer cost + End user cost + maintenance cost for components you buy Buy a component if: Build Component cost > Purchase component cost Improvement in productivity factor for GUI components = 0.4 Your application reuse savings = (0.4 x cost to build) x (number of applications - 1) Your cost per user = Component cost / sum of users across all applications (ignoring overlap in users)