Computer-assisted assessment (CAA) is problematic when it comes to fostering creativity, because in educational thinking the essence of creativity is not finding the correct answer but generating novelty. The idea of "functional" creativity provides rubrics that can serve as the basis for forms of CAA leading to either formative or summative assessment of the creativity of all kinds of classroom assignments, both by teachers and by students themselves. An electronic performance support system in the form of a smartphone App based on the principles of functional creativity is under development. This will provide feedback to users on the 4Ps of creativity: Product, Person, Process, and Press.