The principle aim of this study is to conduct validity and reliability studies of "Technology Proficiency Self-Assessment (TPSA)" scale, developed by Ropp (1999). For this aim, in the first place; the language validity of the scale was provided with the help of experts. Then in order to analyze the factors, the scale was applied to 205 in-service primary school teachers from variety of branches. By the factor analysis conducted, it was determined that the scale has single factor (dimension) and 20 items. That the items of the scale have high eigenvalues indicates the scale has appropriate structure validity. In addition, the inner reliability of the scale was calculated quite high (alpha = .94), which implies that the scale can be used as a reliable source to assess technology self-efficiency of individuals. (C) 2010 Elsevier Ltd. All rights reserved.