2. Structure

2.5 How are the levels determined?

Where ratings start

Process Attributes are rated based on an evaluation of the Assessment Indicators. Using a simple algorithm  the Capability levels are determined from the Process Attribute Ratings.

Base Practices: See chapter 2.2.

Output Work Products: See chapter 2.2.

Generic Practices break down a Process Attribute into more detailed activities. Generic Practices are checked and rated in an assessment. Users often find it difficult to interpret Generic Practices for the different processes.

Generic Resources suggest resources, methods, tools and infrastructure elements which are useful when implementing Generic Practices. Generic Resources are usually not checked in detail and are not rated.

Assessment Indicators
Assessment Indicators
Relationships between model elements for the rating of Capability Levels; elements of the Process Dimension are shown on the left and elements of the Capability Dimension on the right.
Relationships between model elements for the rating of Capability Levels; elements of the Process Dimension are shown on the left and elements of the Capability Dimension on the right.

How the Automotive SPICE rating method works

The Process Attributes of every process in the assessment scope are rated using the NPLF rating scale. Process Attribute ratings are determined from the NPLF rating of Base Practices and Generic Practices. All other Assessment Indicators aren’t rated. The NPLF rating scale is defined as follows:

  • N (Not achieved), corresponds to 0-15%. There is little or no evidence of achievement of the defined process attribute in the assessed process.
  • P (Partially achieved), corresponds to >15-50%. There is some evidence of an approach to, and some achievement of, the defined process attribute in the assessed process. Some aspects of achievement
    of the process attribute may be unpredictable.
  • L (Largely achieved), corresponds to >50-85%. There is evidence of a systematic approach to, and significant achievement of, the defined process attribute in the assessed process. Some weaknesses related to this process attribute may exist in the assessed process.
  • F (Fully achieved), corresponds to >85-100%. There is evidence of a complete and systematic approach to, and full achievement of, the defined process attribute in the assessed process. No significant weaknesses related to this process attribute exist in the assessed process.

How the Capability Levels are determined

A Capability Level is determined through these steps:

1. Rate the Base Practices using NPLF.

2. Determine the NPLF rating of GP1.1.1 from the NPLF ratings of the Base Practices. One can use the average of the NPLF ratings of the Base Practices as a first guess. However, because the Base Practices have different importance, assessors often deviate from this average.

3. The rating of PA1.1 is adopted from the rating of GP1.1.1.

4. For all subsequent Process Attributes (PA2.1, PA2.2, …) their Generic Practices are rated using NPLF. One can use the average of the NPLF ratings of the Generic Practices as a first guess. However, because the Generic Practices have different importance, assessors often deviate from this average.

5. Repeat step 4 until all Process Attributes have been rated for your target level (e.g., PA1.1 + PA2.1 + PA2.2 for Capability Level two).

6. The resulting Capability Level is determined as shown in the picture.

A Capability Level is achieved if all its Process Attributes are at least "L" and all Process
Attributes below are "F".
A Capability Level is achieved if all its Process Attributes are at least “L” and all Process Attributes below are “F”.

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