Nomological network

• At least two constructs;
• One or more theoretical propositions, specifying linkages between constructs, for example: "As age increases, memory loss increases".
• Correspondence rules, allowing each construct to be measured empirically. Such a rule is said to "operationalize" the construct, as for example in the operationalization: "Age" is measured by asking "how old are you?"
• Empirical linkages represent hypotheses before data collection, empirical generalizations after data collection.

Validity evidence based on nomological validity is a general form of construct validity. It is the degree to which a construct behaves as it should within a system of related constructs (the nomological network).^[3]

Nomological networks are used in theory development and use a modernist^{[clarification needed]} approach.^[4]

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