The 'Loop Group' was formed at the Oregon State University Department of Fisheries and Wildlife, but it is now an electic, informal association of the Corvallis-area scientists, dedicated to the study of ecological systems using qualitative mathematical models.  We call ourselves the 'Loop Group' because the type of models we examine has been the loop analysis, although it is more formally known as graph theory.  We believe that qualitative models will stimulate ecosystem management because reasonable descriptions of systems behavior can be attained without quantitative parameterization.  This means that good descriptive research can provide the basis for the models of the community of interest.  We believe that this is consonant with the principles of Adaptive Management that we can determine risk and uncertainty through extensive simulation of partially specified systems.