Content validity (also known as logical validity) refers to the extent to which a measurement represents all facets of a given social concept, and whether the assessment content and composition are appropriate, given what is being measured. For example, depression scales may lack content validity if they only look at the affective dimension of depression but fail to assess the behavioural dimension.
Hurst, Melissa. “Validity in Assessments: Content, Construct & Predictive Validity.” Education Portal. Online: http://education-portal.com/academy/lesson/validity-in-assessments-content-construct-predictive-validity.html#lesson (Retrieved on August 13, 2014)
Landine, Jeffrey and John Stewart, “Assessment in Career Guidance.” In Blythe C. Shepard and Priya S. Mani (editors). Career Development Practice in Canada: Perspectives, Principles and Professionalism. Toronto: Canadian Education and Research Institute for Counselling (CERIC), 2014, p.434.
Pope, Greg. “Understanding Assessment Validity: Content Validity.” Online: http://blog.questionmark.com/understanding-assessment-validity-content-validity (Retrieved on August 13, 2014)