SUMMARYPurpose: To develop and validate a scale of social functioning for people with epilepsy (PWE)-the Social and Occupational Functioning Scale for Epilepsy (SOFSE). Methods: According to the literature review and opinions from a panel of experts, PWE, and caregivers, a total of 31 questions were compiled. Questionnaires were analyzed from 172 adults with epilepsy. Key Findings: The final scale had 30 items in six dimensions. The results showed that internal consistency coefficients and test-retest reliabilities for each dimension ranged from 0.70 to 0.84 and 0.72 to 0.89, respectively. Retest reliability for the total SOFSE score was 0.92. Seven factors were extracted through principal factor analysis. Moreover, criterion-related validity was demonstrated by the significant correlations between the SOFSE and the following measures: the Mini Mental Status Examination (r = 0.60, p < 0.001), the Quality of Life in Epilepsy-31 (r = 0.53, p < 0.001), and the Global Severity Index of the Symptom Checklist-90-Revised (r = À0.66, p < 0.001). Finally, the differences in functional competence among patients also supported the discriminant validity of the inventory. Significance: The SOFSE is a brief, psychometrically sound, and easy-to-administer measure of social functioning for use in busy clinical settings. KEY WORDS: Inventory, Questionnaire, Quality of life, Reliability, Validity.Epilepsy is a chronic disorder characterized by recurrent seizures and has significant psychological and social consequences for everyday living. People with epilepsy (PWE), even those with well-controlled seizures, may face emotional distress, low self-esteem, reduced social interactions, decreased job opportunities, and problems with daily activities (Hermann & Jacoby, 2009;McCagh et al., 2009). Assessing quality of life (QoL) in epilepsy is now a common approach to determining the psychosocial impact of seizures and of treatment outcomes on patients' lives (Lee, 2010). Numerous epilepsy-specific QoL instruments have been developed, such as the Quality of Life in Epilepsy-89 (QOLIE-89) inventory (Devinsky et al., 1995), and most of them are self-rated evaluations of the effects of seizures on physical, psychological, and social aspects of life (Leone et al., 2005).QoL can be measured both subjectively (e.g., an indicator of satisfaction with life in general) and objectively (e.g., indicators of health and living conditions; McDowell, 2006;Brissos et al., 2011). However, certain disadvantages have been noted for these QoL measures. For instance, the same QoL measure can be interpreted differently depending on the individual, according to their subjective views of reality at the time of interview (Stennar et al., 2003;McDowell, 2006). Moreover, the patient may adapt to his/her illness and modify his/her perspective on the severity of the disease; this means that changes in patient-rated QoL over time do not correspond with objective measures of loss of function (McDowell, 2006). Therefore, it has been suggested that QoL does not determin...