An interdisciplinary development project is presented in which a new computer-controlled plant was built for batch chemical treatment of TiO2-based pigment. As the details of process operation and control were not known until the starr up, the success of the project depended much on efficient cooperation between process design and control engineers. In the paper the main process design and control design problems which had to be solved are described. Shown are also some interesting solutions and the particular art of managing this innovative project.