Component based development, especially component-based software development squarely puts the emphasis on developing mega software systems by integrating existing software components. This approach saves time, energy and money by eliminating the need to re-write the entire applications. Instead under component-based development, specified components of an existing application are written once and along with the other main components of the same existing application, the software is re-built.

Component based development is essentially about composing of softwares rather than programming. The result is that the software is made available in the quickest possible time frame. These softwares developed using component based software development, offer flexibility, easy availability and reduction in start-up delays. Many of the existing technologies like Active X, NET, VB, C++, COM/COM+, Java, J2EE and others are being brought under component based development. Component-based software development enhances the flexibility and maintenance needs of the existing softwares.

Excellone in Sydney, Australia has been using component-based software development so that the clients can benefit from reduced software development and software maintenance costs. In addition, component based development offers speedy deployment of applications and flexibility of operations. Excellone has worked with the fundamentals of component-based software development, writing the frequently recurring components of a large software system so that these components made only once and assembling through re-use, the other common components rather than re-writing. This has led to the off-the-shelf availability of products and components, made available through buying rather than building.