BS ISO/IEC 33004:2015 pdf download-Information technology — Process assessment — Requirements for process reference, process assessment and maturity models.
6.3.6 If the selected process measurement framework provides a nominal scale, then the process assessment model shall, for a given process, address all of the defined process attributes, including the process performance attribute. 6.3.7 If the process measurement framework provides an ordinal or interval scale, then the process assessment model shall address, for a given process, all, or a continuous subset, of the levels (starting at process quality level 1) of the process measurement framework for the process quality characteristic for each of the processes within its scope. NOTE It would be permissible for a model, for example, to address solely process quality level 1, or to address process quality levels 1, 2 and 3, but it would not be permissible to address process quality levels 2 and 3 without process quality level 1. 6.3.1 Assessment Indicators A process assessment model shall be based on a set of assessment indicators that: a) explicitly address the purpose and process outcomes, as defined in the selected process reference model, of each of the processes within the scope of the process assessment model; b) demonstrate the achievement of the process attributes within the scope of the process assessment model; c) demonstrate the achievement (where relevant) of the process quality levels within the scope of the process assessment model. The assessment indicators generally fall into three types: a) practices that support achievement of either the process purpose or the specific process attribute. b) information items and their characteristics that demonstrate the respective achievements. c) resources and infrastructure that support the respective achievements. 6.3.2 Mapping process assessment models A process assessment model shall provide explicit mapping from the relevant elements of the process assessment model to the processes of the selected process reference model(s), and to the relevant process attributes of the selected process measurement framework.