The classification by many scholars of numerical research processes as quantitative and other research techniques as qualitative has prompted the construction of a third category, that of "mixed methods", to describe studies that use elements from both processes. Such labels might be helpful in structuring our understanding of phenomena. But they…

This article considers the emerging method of design experimentation, and its developing use in educational research. It considers the extent to which design experiments are different from other, more established, methods and the extent to which elements of established methods can be adapted for use in conjunction with them. One major issue to be…