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Figure 10 EPG Outline and Description of Risk Driven Analysis Figure 11 The “Outputs” Section of the Description on the Right of Figure 10. 26 CMU/SEI-2000-SR-008
4 Summary This paper has presented a preliminary definition of the spiral development model and characterized the model further by presenting a set of six “invariant” attributes. That is, six properties which every spiral development process must incorporate. These are listed in Table 2 along with a notion of why they are necessary and a few characteristics, called “variants,” that may vary from one spiral process model to another. Numerous process models with development structured in a cyclic series of efforts can appear to be spiral models and yet violate one or more invariants and subsequently fail. These are listed in Table 3, together with a reference to further discussion in the text. The second part of the paper was devoted to the anchor point milestones of Invariant 5. These milestones— Life Cycle Objectives (LCO), Life Cycle Architecture (LCA), and Initial Operating Capability (IOC)— provide concrete artifacts to drive the project toward completion. They also provide for comparison, evaluation, and planning between projects. The discussion concluded with the WinWin spiral model and MBASE, which assist in the use of the anchor point milestones. This paper is intended as a sufficient characterization of the spiral development model to distinguish it from other project process models. Although not within itself a full description and user's guide for the spiral development model, it is a suitable basis for such further works. CMU/SEI-2000-SR-008 27
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Page 14 and 15: applications discussed in [Bernstei
Page 16 and 17: •For how long should it continue?
Page 18 and 19: 2.1 Spiral Invariant 1: Concurrent
Page 20 and 21: showed that a four-second response
Page 22 and 23: isk resolution techniques for the m
Page 24 and 25: Example: Pre-Ship Testing Figure 4
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Page 30 and 31: a batch-processing computer system
Page 32 and 33: Table 1: WinWin Spiral Anchor Point
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Page 36 and 37: MBASE Electronic Process Guide The
Page 40 and 41: Table 2: Invariants of Spiral Proce
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Page 44 and 45: [Boehm 00b] Boehm, B; Abi-Antoun, M
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Page 48 and 49: OO OOA&D OSD OUSD/AR PMI POM QFD RO

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