Computational Grids are a new trend in distributed computing systems.In the dis- tributed environment every node has its own operating system, own resources, own processing speed, so the responsibility of communication between di erent platforms have been done by middleware.For this purpose, middleware takes the jobs from users and according to the job speci cation resource discovery has been done by middleware as a rst step then assign the job to the particular resource, which has been discov- ered. So the middleware is responsible for the resource discovery, resource allocation and job will...