In this paper, we present a computerized tool developed specifically for a study that examined the development of creative thinking among third and fourth graders, following multidisciplinary instruction that combined mathematics and music. The computerized tool included closed and open questions. The closed questions allowed the students to perform separated mathematical and musical tasks by typing a specific melody, rhythm, pattern, or mathematical form. The open questions required the students to respond freely and creatively using the computer keyboard or a virtual piano keyboard. The programming was written in Max/MSP environment using BACH package that enables generating, modifying, and playing musical scores either with a mouse or keyboard. The software was built in a modular way by using math and music units, which makes it possible in the future to expand the number of tasks as needed. The article reviews the necessity of developing a technological tool for the research, the deliberations that accompanied the development of the technological tool, the technology's contribution to monitoring creative thinking process and drawing conclusions for further research.