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The concept of process capability determination by using a process assessment model is based on a two-dimensional framework. The first dimension is provided by processes defined in a process reference model (process dimension). The second dimension consists of capability levels that are further subdivided into process attributes (capability dimension). The process attributes provide the measurable characteristics of process capability.
The process assessment model selects processes from a process reference model and supplements with indicators. These indicators support the collection of objective evidence which enable an assessor to assign ratings for processes according to the capability dimension.
The relationship is shown in Figure 1:
Process assessment model (Automotive SPICE)
Process capability indicators
Process performance indicators
Measurement framework (ISO/IEC 33020)
Capability levels
Process attributes
Rating
Scale
Rating method
Aggregation method
Process capability level model
Process reference model (Automotive SPICE)
Domain and scopes
Process purposes
Process outcomes
Process1 Process2 Process3 Process4 ...
Figure 1 — Process assessment model relationship