I am now in a truly interdisciplinary environment if researchers representing all the social sciences, public health, and medicine. It gives you a very different perspective on research and academic narrowness defined by our disciplines. Some questions:
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"(W)here either internal validity or representativeness must be sacrificed, which should it be? The answer is clear. Internal validity is the prior and indispensable consideration."
http://rogosateaching.com/somgen290/campbell_1957.pdf