Due to their constant interactions with IT, users accumulate beliefs they hold toward their selves as IT users. Given the ambivalent nature of IT, individuals tend to develop ambiguous and incoherent beliefs toward their selves as IT users. This can lead users to limit the efficacy of their interactions with IT and negatively affect their overall perception of themselves. This paper conceptualizes the IT Self-Concept Clarity (ITSCC) construct to improve the predictive power of models interested in the users' daily interaction with IT. We also develop a measurement scale for ITSCC. We validate the scale by performing three studies. We perform a pre-test, a cross-sectional survey study and an experimental manipulation study. We outline the positive relationship between ITSCC and computer self-efficacy and self-esteem. We also validate the effect of the experimental manipulation on our scale, which will allow assessing the causal impact of ITSCC in future studies.