Construct-based validity is the most interesting and the most difficult of all the validities to establish because it is based on some underlying construct, or idea, behind a test or measurement tool. You may remember from your extensive studies in Psych 1 that a construct is an abstract trait that can’t be directly observed. For example, aggression is a construct (consisting of such variables as inappropriate touching, violence, lack of successful social interaction, etc.), as are intelligence, mother–infant attachment, and hope. And keep in mind that these constructs are generated from some
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