5.3: Sequencing Plan
Develop the Sequencing Plan Other Information:
The changes needed to transition from the current state of the enterprise to the goals and conditions expressed by the target
architecture cannot be achieved in a single quantum step. Evolving the enterprise from its baseline to the target architecture
needs multiple concurrent interdependent activities and incremental builds. The best way to understand and control this complex
evolutionary process is by developing and maintaining a systems migration roadmap or sequencing plan. The sequencing plan
should provide a step-by-step process for moving from the baseline architecture to the target architecture. The sequencing
plan may be supported by a set of architecture products, similar to the baseline and target architecture products, generated
for several intermediate points in time between the baseline and target environments. The succession from one point in time
to the next, and on to the target timeframe, establishes a migration sequence. Because the sequencing plan represents the
current environment, as well as the development programs that are both planned and under way, it becomes a primary tool for
program management and investment decisions. To remain current and to support continued coordinated improvements across the
enterprise, the sequencing plan should be maintained and updated as time and circumstances dictate. In addition to specific
development requirements for the new components in the target architecture, development of the sequencing plan should consider
a wide variety of inputs, including: • Sustainment of operations during transition • Existing technical assets and contractual
agreements • Development programs currently underway • Anticipated management and organizational changes • Business goals
and operational priorities (including legislation and executive directives) • Budget priorities and constraints. Tasks: 5.3.1.
Identify Gaps 5.3.2. Define and Differentiate Legacy, Migration, and New Systems 5.3.3. Planning the Migration
Indicator(s):
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