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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.
== Views ==
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Another originality of ClearCase is its MultiSite extension. In this model, there is no real master database, but instead peer ''replicas'', kept in-step in an asynchronous way (with close to no penalty to end-users).
Since replicas are kept in sync in an asynchronous way, ClearCase must keep track of access so that multiple teams do not perform conflicting operations. The paradigm of mastership allows this. Specific data or metadata within a VOB have a property which specifies what particular replica is allowed to modify them. Thus, a VOB object or piece of metadata can only be manipulated by one replica at a time. MultiSite also has the ability to change this property so that different teams can change the mastership of VOB data. This can be done by changing the mastership manually from a "giving" site or by a request for mastership from a "receiving" site.
== UCM ==
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