DIO is a toolkit to support development of computational thinking for STEM education. DIO is designed and developed as per the theory of Constructionism given by Seymour Papert. DIO comprises of a variety of input, output modules that can be combined together by children to create a variety of interactive applications. We conducted extensive user studies to evaluate the toolkit regarding our research goals. This project is currently under publication review, hence I cannot reveal the details here. Please email me for more information on this project.