He went on to note that empirical research need not involve large numbers. He cited clinical investigations being conducted in the Soviet Union as sources of hypotheses to be tested using wider selections of students and teachers. The complexity of the phenomena under study-the mind of the child, the mathematics classroom-however, meant that “to restrict ourselves to small scale observations would be to sacrifice the generality of our theories” (p. 243). Begle ended with a statement of his research credo: “Only by becoming more scientific can we achieve the humanitarian goal of improving education for our children and for everyone’s children” (p. 243).