Experimental design is one aspect of a scientific method. A well-designed, properly conducted experiment aims to control variables in order to isolate and manipulate causal effects and thereby maximize internal validity, support causal inferences, and guarantee reliable results. Traditionally employed in the natural sciences, experimental design has become an important part of research in the social and behavioral sciences. Experimental methods are also endorsed as the most reliable guides to policy effectiveness. Through a discussion of some of the central concepts (...) associated with experimental design, including controlled variation and randomization, this chapter will provide a summary of key ethical issues that tend to arise in experimental contexts. In addition, by exploring assumptions about the nature of causation and by analyzing features of causal relationships, systems, and inferences in social contexts, this chapter will summarize the ways in which experimental design can undermine the integrity of not only social and behavioral research but policies implemented on the basis of such research. (shrink)

The payment of human subjects is an area where Institutional Review Boards have wide discretion. Although the “Common Rule” requires the provision of full information to human research participants to secure valid consent, the Rule is silent on the issue of payment. Still, some federal agencies offer guidance on the matter. For example, the National Science Foundation cautions that high payments for risky research “may induce a needy participant to take a risk that they normally would prefer not to take.” (...) For research under its purview, the Food and Drug Administration guidance provides that “[a]dvertisements may state that subjects will be paid, but should not emphasize the payment or the amount to be paid, by such means as larger or bold type.” One might read the FDA guidance to permit the advertisement for human subjects to state the specific amount of payment, as long as it is not emphasized. (shrink)