statistics:construct

About

A construct is an ideal “object” that is not directly observable, as opposed to “real” observable objects

Operationalizing a construct is the process of defining a construct to make it observable and quantifiable

Construct	Operationalization
Intelligence	Intelligence Test
Verbal ability in children	A vocabulary test

Construct validity

Content validity: Does the test consist of a content that the population and sample should know
Convergent validity: Does the test correlate with other, established measures?
Divergent validity: Does the test correlate less well with measures designed to test a different type of ability?
Nomological validity: Are scores on the test consistent with more general theories.