THE PATTERNS OF CARE STUDY (PCS), designed to survey radiation therapy practice nationwide, has been conducting a Process Survey since 1974 with multiple visits to sample radiation therapy facilities. Detailed analyses of the survey data revealed significant deficiencies in record keeping. Information was incomplete in patient radiation therapy records, and patient hospital records frequently contained inaccurate descriptions of the disease process or treatment. As a result. PCS developed decision information worksheets for 10 disease sites to provide a single source for defining disease extent and for making treatment decisions. The sites include testis,: prostate, nasopharynx, larynx, Hodgkin's disease, corpus, cervix, male and female urinary bladder, breast, and anterior two-thirds of tongue and floor of mouth. A sample worksheet is presented for use by the practitioner.