Selectionist theory in psychology conceptualizes behavior as a dynamic
phenomenon subject to a variation and selection process similar to th
at characterizing biological evolution. Though not formally recognized
as a dominant psychological metatheory, selectionist thought can be i
dentified in the writings of many of the discipline's eminent scholars
. Although selectionism may possess considerable promise as a unifying
theory, its widespread acceptance has likely been impeded by the larg
e sample, null hypothesis testing research designs associated with the
fisherian tradition.