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validity centered design

"
Quantitative psychologists have been quite happy with the idea of
experimental design. Perhaps more of us can become comfortable with the principled design of
both instruments and theory. Why not forthrightly seek to design and revise and experiment until
we have evidence for all six aspects of construct validity, as well as evidence for desirable
values, positive consequences, utility as ease of use, and all aspects of the unified validity
model?"

"
Validity centered design as its current practitioners understand and use it is the beginning
of a principled design process for designing and developing improved domain theories, the
construct-linked measurement scales associated with them, and documenting the evidence for a
validity argument. The validity argument is not accomplished all at one (and indeed, never ends),
but is improved step by step as we complete work on each aspect of validity. It also includes
planning for future activities to improve other aspects of the validity argument in an ongoing
process." (Bunderson 2003, p. 12)
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