Process Overview

CCPDS-R software development followed a standard Department of Defense life cycle after contract award, with a software requirements review, preliminary design review, critical design review, and final qualification test. The life cycles of the 12-month competitive design phase and full-scale development phase are easily mapped to the phases of the iterative process framework presented in Chapter 5. Figure D-4 illustrates this mapping.

To manage this large software effort, six incremental builds were defined. Figure D-4 summarizes the build content and overlap, and the individual build metrics and microprocess are further described in Section D.5.1. The conclusion of each build corresponded to a new baseline of the overall Common Subsystem. From a mac-roprocess view, the initial milestones focused on achieving a baseline architecture. The PDR baseline required three major architecture iterations, the conclusions of which coincided with the milestones for the software requirements review (SRR), interim PDR (IPDR), and PDR:

1. The SRR demonstration: initial feasibility of the foundation components, and basic use cases of initialization and interprocess communications

2. The IPDR demonstration: the feasibility of the architectural infrastructure under the riskiest use cases, including the following:

• A peak data load missile warning scenario of a mass raid from the Soviet Union

• A peak control load scenario of a system failover and recovery from the primary thread of processing to a backup thread of processing with no loss of data

3. The PDR demonstration: adequate achievement of the peak load scenarios and the other primary use cases within a full-scale architectural infrastructure, including the other critical-thread components

The CDR demonstration updated the architecture baseline to represent the equivalent of an alpha test capability for the complete architectural infrastructure and the critical-thread scenarios. This was a usable system in that it provided a set of complete use cases sufficient for the user to perform a subset of the mission.

d.5 process overview 311

Building blocks

Infrastructure

Critical . threads

Noncritical threads

Completeness: maturation, tuning

Requirements analysis Architecture analysis

Architecture synthesis Critical-thread demonstration

SRR Demo

Architecture maintenance Applications construction

Build 0

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