The emerging interface between computer technology and cognitive psychology for performance assessment in science education is explored. Cognitive theories of learning offer promises to transform computer technology from a test administration tool into a process assessment tool, and computer technology offers a medium for studying the cognitive processes of learning. Interface theories and interface technologies are briefly discussed. The technology-psychology interface may be a base for building an alternative assessment technology. Some prototype projects in this line of inquiry are presented. As in any other novel approaches to testing, there are several questions that need to be answered in establishing the role of the technology-psychology interface in performance assessment.