The purpose of this study was to refine the Western Consortium for Cancer Nursing Research (WCCNR) stomatitis staging system. Fifty-six adult cancer patients were accrued. Using all eight descriptors, 96.4% of the participants were correctly staged. Using only lesions, colour and bleeding, however, 92.9% of the cases were correctly staged. Based on the findings of this study, the WCCNR stomatitis staging system has been shortened to include only lesions, colour and bleeding. The significance of stomatitis as a result of cancer therapy was recognized by the National Institute of Health Consensus Development Conference (1990). Incidence levels range from 10% to 97% in patients receiving stomatotoxic chemotherapy protocols (Barrett, 1987; Morry, 1984; Seto, Kim, Wolinsky, Mito & Champlin, 1985). A survey of cancer nurses in Canada identified the prevention and treatment of chemotherapy-induced stomatitis as the top research priority (Western Consortium for Cancer Nursing Research, 1987). The WCCNR, a group comprised of one academically-based individual and one clinically-based individual from each of the four western Canadian provinces, was interested in developing interventions for the prevention and management of stomatitis, but was hampered by the lack of a valid and reliable assessment tool.