Convergent validity  From Wikipedia, the free encyclopedia -
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validity, a parameter often used in sociology, psychology, and
other behavioral sciences, refers to the degree to which two
measures of constructs that theoretically should be related, are
in fact related.[1] Convergent validity, along with discriminant
validity, is a subtype of construct validity. Convergent
validity can be established if two similar constructs correspond
with one another, while discriminant validity applies to two
dissimilar constructs that are easily differentiated.  Campbell
and Fiske (1959) developed the Multitrait-Multimethod Matrix to
assess the construct validity of a set of measures in a
study.[2] The approach stresses the importance of using both
discriminant and convergent validation techniques when assessing
new tests. In other words, in order to establish construct
validity, you have to demonstrate both convergence and
discrimination.[3]   Convergent validit