The self-efficacy construct is a useful base for developing measures of the individual's self-perception and self-competency in interacting with the Internet. Using 277 responses, a 17-item Internet self-efficacy scale is developed and validated. A principal factor analysis of the scale supported a conceptually meaningful three-factor model with high alpha reliabilities. The recommended three-factor 17-item instrument measures Internet self-efficacy in terms of surfing/browsing, encryption/decryption and system manipulation. Evidence of reliability and construct validity is presented for the hypothesized measurement model and future research is discussed.