Component based software development is the reuse of the existing software. By reusing the component have cheaper cost, better quality, improved performance. The reusable component performs better than existing software. It provides a standardized system. But finding components for efficient software reuse is one of the important problems identified by researchers as well as artefacts which constitute a software system. Many researches have also been done in improving cohesion and reducing coupling for source code and to recover software architecture in reverse engineering process, grouping of component is done. The objective of our paper is to improve design and to examine numerical clustering techniques and implement these techniques for different software applications. Different clustering techniques for component reuse and program restructuring are hierarchical clustering, density based clustering,SOM.