A majority of actual policy is not developed by Congress but by regula
tory agencies that have been delegated the authority to interpret cong
ressional intent. Using some of the major variables associated with in
terest group influence on Congress, this study examines a model of int
erest group influence on agency rule makings. The study uses survey da
ta to examine how interest groups relate to regulatory agencies, how t
hose groups participate in rule making, and how they perceive the effe
ctiveness of their participation. The full models and certain theoreti
cal variables support the interest group influence on rule-making hypo
theses, but some major discrepancies arise concerning commonly held th
eories of the political science literature. The study will, it is hope
d, lead to further research on the important relationship between inte
rest groups and regulatory agencies.