The purpose of this study is to develop and validate an instrument to measure organizational IT. We adopted the resource-based view (RBV) of the firm and the dynamic capabilities theory to propose the Dynamic IT Capability (DITC) instrument. Dynamic IT Capability is defined as the ability to integrate, build, and reconfigure IT-based resources and competencies to adjust to rapidly-changing environments, including IT infrastructure, human IT resources, IT-enabled intangible resources, and IT reconfigurability. A survey was developed for these four components and distributed to IT-related companies to collect data. A series of statistical procedures were used to analyze the data, which proved that the instrument is valid and reliable. This study makes a contribution to both academic research and management practice. Theoretically, this study provides a measurement of IT in organizations for examining IT business value. In practice, the results of this study will help organizations evaluate their dynamic IT capability.