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Table 1 Unified Model of Validity: The five sources of validity to support construct validitya

From: Assessment of motivational interviewing: a qualitative study of response process validity, content validity and feasibility of the motivational interviewing target scheme (MITS) in general practice

Source  
Content Refers to themes, wording, and format of items, and includes expert review and other systematic item development strategies.
Response Process Is about the actions and thought processes of the test-users (including scoring) that reduce the likelihood of response error.
Internal Structure Concerns acceptable reliability and factor structure.
Relation to Other Variables Concerns correlation with scores from other instruments.
Consequences Is about the soundness of test score based decisions.
  1. a In the Unified Model of Validity, all validity should be conceptualized under one overarching framework, the “construct validity” [17]