Editing Construct validity (section)

=== Multitrait-multimethod matrix ===
{{Main|Multitrait-multimethod matrix}}
The [[multitrait-multimethod matrix]] (MTMM) is an approach to examining construct validity developed by Campbell and Fiske (1959).<ref name="Campbell"/> This model examines convergence (evidence that different measurement methods of a construct give similar results) and discriminability (ability to differentiate the construct from other related constructs). It measures six traits: the evaluation of convergent validity, the evaluation of discriminant (divergent) validity, trait-method units, multitrait-multimethods, truly different methodologies, and trait characteristics. This design allows investigators to test for: "convergence across different measures...of the same 'thing'...and for divergence between measures...of related but conceptually distinct 'things'.<ref name="Quasi-experimentation"/><ref>{{cite journal | author = Edgington, E. S. |date=1974 | title =  A new tabulation of statistical procedures used in APA journals | journal = American Psychologist | volume = 29 | page = 61 | doi = 10.1037/h0035846 }}</ref>