Whats is difference between Mercury TestDirector & IBMClearCase.

Mercury TestDirector allows you to deploy high-quality applications quickly and effectively by providing a consistent, repeatable process for gathering requirements, planning and scheduling tests, analyzing results, and managing defects and issues. TestDirector is a single, Web-based application for all essential aspects of test management Requirements Management, Test Plan, Test Lab, and Defects Management. You can leverage these core modules either as a standalone solution or integrated within a global Quality Center of Excellence environment.Using TestDirector, multiple groups throughout your organization can contribute to the quality process:

--Business analysts define application requirements and testing objectives
--Test managers and project leads design test plans and develop test cases
--Test automation engineers create automated scripts and store them in the repository
--QA testers run manual and automated tests, report execution results, and enter defects
--Developers review and fix defects logged into the database
--Project managers create application status reports and manage resource allocation
--Product managers decide whether an application is ready to be released.

Rational ClearCase is a software tool for revision control (configuration management, SCM etc) of source code and other software development assets. It originally derived from a product of Apollo Computers: DSEE (Domain Software Engineering Environment), which was ported to Unix and further developed by Atria Software after Hewlett-Packard bought Apollo. Atria later merged with Pure Software to form PureAtria. That firm merged with Rational Software, which was purchased by IBM. IBM continues to develop and market ClearCase. ClearCase forms the base of version control for many large and medium sized businesses and can handle projects with hundreds or thousands of developers, but the price is quite steep for smaller companies.

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