A collection of articles prepared in honor of J.R. Kantor and his systematic viewpoint of the science of psychology. The interbehavioral alternative represents a clear departure from the traditions of dualism and simple reductionism: it identifies with natural science and replaces the paradigm accepted by most versions of psychology. Unlike other schools of psychology, it begins with the observed events of an integrated field involving an organism in reciprocal or ecological relation with other factors in the field.