Lifecycle Expectations

There is no mathematical or formal derivation for using the seven core metrics. However, there were specific reasons for selecting them:

• The quality indicators are derived from the evolving product rather than from the artifacts.

• They provide insight into the waste generated by the process. Scrap and rework metrics are a standard measurement perspective of most manufacturing processes.

• They recognize the inherently dynamic nature of an iterative development process. Rather than focus on the value, they explicitly concentrate on the trends or changes with respect to time.

• The combination of insight from the current value and the current trend provides tangible indicators for management action.

The actual values of these metrics can vary widely across projects, organizations, and domains. The relative trends across the project phases, however, should follow the general pattern shown in Table 13-3. A mature development organization should be able to describe metrics targets that are much more definitive and precise for its line of business and specific processes.

Table 13-3. The default pattern of life-cycle metrics evolution

metric

inception

elaboration

construction

transition

Progress

5%

25%

90%

100%

Architecture

30%

90%

100%

100%

Applications

<5%

20%

85%

100%

Expenditures

Low

Moderate

High

High

Effort

5%

25%

90%

100%

Schedule

10%

40%

90%

100%

Staffing

Small team

Ramp up

Steady

Varying

Stability

Volatile

Moderate

Moderate

Stable

Architecture

Volatile

Moderate

Stable

Stable

Applications

Volatile

Volatile

Moderate

Stable

Modularity

50%-100%

25%-50%

<25%

5%-10%

Architecture

>50%

>50%

<15%

<5%

Applications

>80%

>80%

<25%

<10%

Adaptability

Varying

Varying

Benign.

Benign

Architecture

Varying

Moderate

Benign

Benign

Applications

Varying

Varying

Moderate

Benign

Maturity

Prototype

Fragile

Usable

Robust

Architecture

Prototype

Usable

Robust

Robust

Applications

Prototype

Fragile

Usable

Robust

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