1. Component-Based Software Development Jacob Fetner

2. Key Points What is Component-Based Software Engineering (CBSE)? Component − What is a component? − Aspects of well-designed components Integration of components Advantages of CBSE Disadvantages of CBSE Future of CBSE

3. What is CBSE? Component-based software engineering is the idea of building software from established software components, as opposed to building the software from the ground up. Components interact through well- defined interfaces.

4. Components A software component is a program module that can be used independently, or can operate in conjunction with other components. Components should be executable to allow independence. Components should only be visible through their interface.

5. Integration of Components Components are combined and/or integrated by the use of middleware. This middleware provides a set of predefined services for enabling component composition and interaction. Examples: CORBA, COM, RMI. Some middleware technologies are incompatible with each other.

6. Advantages of CBSE Divides large projects into smaller subprojects CBSE is language independent. Reduced time to market Increased productivity/quality Reusability of components Easy to replace components

7. Disadvantages of CBSE Making Components Reusable − Increased Development time − Harder to identify requirements − Decreases usability Choosing Middleware − Incompatible technologies Testing is Harder − Unknown uses of components High initial cost − Training of developers

8. Future of CBSE Adoption of compatible Middleware standards Certification of Components More tools to support CBSE