SYNOPSISIn order to determine the generality of the Kudrow‐Sutkus (1979) MMPI classification system for diagnosing headache type, a cross‐validation analysis was performed on 99 headache subjects. Results indicated a high level of support for Kudrow‐Sutkus' Group A (migraine and cluster) classification criteria (65.4% and 75.0% correct assignments for female and male subjects, respectively) but a low level of support for Kudrow‐Sutkus' Group B (combined and chronic scalp muscle tension) classification criteria (5.9% and 25.2% correct assignments for female and male subjects, respectively). Possible reasons accounting for these differences are di