Cronbach α was 0.90, indicating good internal consistency. Eliminating individual items in turn made little difference in Cronbach α (range, 0.89-0.90). Item total correlations ranged from 0.44 to 0.76 (median, 0.68). Exploratory factor analysis extracted just one factor (eigenvalue, 5.37), with no other factors having eigenvalues exceeding 1.00. Factor loadings on individual items ranged from 0.47 to 0.80. CONCLUSION The PeDeSI is a valid, reliable, and clinically practical tool to systematically assess the education and support needs of patients with long-term dermatological conditions and to promote treatment concordance.