This research aims to develop a useful tool based on Evert Rogers’s Diffusion of Innovation Theory and then evaluates the adoption degree of an educational innovation (Smart Board) in Karaj’s Schools. The mixed method approach with explanatory research design has been adopted; this design consisted of two sequential phases, described here as phase 1 (Quantitative) and phase 2 (Qualitative). The research method has been applied for quantitative phase is survey study and for qualitative phase is focus group. Research data gathered by two different tools; a questionnaire developed based on Rogers’s five criteria and a protocol form for doing semi-structured interviews. The overall findings show that this innovation has not been successfully adapted to school's context and so not been considerably accepted among teachers.