The validity of ISA assessments is based on four criteria:

  1. Face validity, in which the explicit definitions of ISA concepts are operationalised using algorithms that are isomorphic with the definitions, so that empirical assessments are directly of the concepts as defined;
  2. Criterion group validity, as when criteria are established that clearly distinguish between one group and another (e.g., gender, ethnicity, clinically distressed state such as depression or anxiety) for which ISA assessments vary accordingly;
  3. Explanatory validity, following comprehension of underlying identity processes according to biography and context, when a comprehensive elucidation of the person's identity processes is achieved;
  4. External validity, as when external independent assessments are made through the use of formal diagnostic procedures or psychometric scales, against which particular ISA parameters can be referenced.
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