One of the main limitations of the current generation of computer-based tests is its dependency on the multiple-choice item. Our work is aimed at extending computer-based testing by bringing limited forms of performance assessment to it in the domain of mathematics. This endeavor involves not only building task types that better reflect valued problem solving, but also creating an integrated set of supports including easy-to-use interfaces, tutorials to teach novice computer users how to negotiate those interfaces, tools that help test developers create items quickly, and mechanisms for scoring constructed responses more efficiently. (24pp.)