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'''Rational ClearCase''' is a [[computer software|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'' ([[Apollo Domain|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.kjbkibnkjnbkijn
Rational supports two types of SCM configurations, UCM (see below), and base ClearCase. UCM provides an out-of-the-box SCM configuration but is fairly rigid. Base ClearCase supplies the basic tools, and can be configured in many different ways.
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