This computer program, a mechanization of the handsorted techniques which geographical dialectology has been using, increases the number of hypotheses that can be explored and the various correlations that can be made. It can draw several of the kinds of maps that dialectologists have used in direct atlases. The hardware, software, and program design of the interactive program are described. Several conversations held with the computer and the maps of scattergrams and isoglosses thus produced are reported. These are based on Harold Allen's Linguistic Atlas of the Upper Midwest. One branch of the program sorts the responses in a variety of ways and calculates the percentages of informants who have given certain responses to certain questionnaire items. Printouts of the program itself and some of the results include: (1) data files of the responses given by informants and information on each informant, (2) a map of the dialects of North and South Dakota, and (3) maps of the several isoglosses and scattergrams drawn by the program. (PMJ)