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37 <h3>A Little History</h3>
39 <p>Many of our clients utilize IBM Rational Clearcase for their
40 SCM system of course. <abbr title="Often spelled as
41 ClearCase">Clearcase</abbr> is the Cadillac of SCM systems. Born
42 in the old Unix workstation company named Apollo and originating
43 from the <abbr title="Distributed Software Engineering
44 Environment">DSEE</abbr> project when HP bought out Apollo,
45 engineers on DSEE project didn't want to see their beloved DSEE
46 die so they started a company named <font
47 class=standout>Atria</font>.</p>
49 <p>Atria did well and was soon bought out by another software
50 company, makers of <font class=standout>Purify</font> - a software
51 product that helps developers find memory leaks in their code.</p>
53 <p>Later <font class=standout>Rational</font>, purveyors of many
54 software engineering environments and tools, bought <font
55 class=standout>PureAtria</font> and for many years it was known
56 simply as <font class=standout>Rational Clearcase</font>.
58 <p>Finally IBM, seeing the wisedom in the <i>Rational Approach</i>,
59 bought out Rational where Clearcase, Multisite, Clearquest and the
60 rest of the Rational suite of tools reside today.</p>
62 <h3>Base Clearcase</h3>
64 <p>Base Clearcase is how Clearcase was originally developed. As
65 such it's a full featured, large, complex and flexible SCM
66 system. Many companies still use Base Clearcase and have build
67 their own set of scripts around Base Clearcase to represent,
68 control enforce policies and automate workflow. IBM Rational saw
69 this and decided to collect the various ways that people use
70 Clearcase to come up with UCM. Still developing software is about
71 as varied as designing snowflakes so UCM does not always fit the
72 environment. As such Base Clearcase is still available and used
75 <h3>Unified Change Management (UCM)</h3>
77 <p>Unified Change Management is a layer built on Base
78 Clearcase to provide additional Software Configuration Management
79 features. These changes include integration with ClearQuest to
80 enforce defect and change tracking with code development through
81 the use of activities. This is part of the Rational Unified
82 Process (RUP) which describes the lifecycle of change management
83 for IBM Rational's software development process. It also gives
84 integrators ownership of projects and streams to allow policy and
85 feature management by project leaders and release engineers. UCM
86 removes the ability/requirement that users manage a configuration
87 specification for a view. UCM is used and configured via either
92 <p>Multisite enables fast, reliable access to software assets
93 across distributed locations. This extends software configuration
94 management across geographically distributed projects through
95 repository replication. This gives you the following benefits:</p>
98 <li>Automatic replication and synchronization of Rational
99 Clearcase repositories enables access to current information,
100 regardless of location</li>
102 <li>Simplifies administration with an easy-to-use Web-based
105 <li>Maintains data integrity by resending information in the
106 event of network failure and automatic recovery of repositories
107 in the event of system failure</li>
109 <li>Works with Clearquest® Multisite for integrated workflow
110 management and defect and change tracking across multiple
111 locations and time zones</li>
113 <li>Scales to support thousands of users, working in dozens of
114 sites, managing terabytes of data<li>
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