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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 HP bought Apollo. Atria later merged with Pure Software to form PureAtria. That firm merged with [[Rational Software]], who was purchased by [[IBM]]. IBM continues to develop and market ClearCase.
ClearCase novelty was in its versioned file system, which can be mounted as a virtual file system through a ''view'', selecting a consistent set of versions and allowing for the production of [[Derived Object|derived objects]]. The view allows thus to map to a [[Software Configuration]]. This was a departure from the ''repository''/''sandbox'' model, allowing for the early management of artifacts (before they are being checked in, and not limited to these first order configuration items).
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