Earl W. Stevick, Adapting and Writing Language Lessons… (1971)
“ Those users who prefer to start with drills or with Cummings devices are free to do so. The dialog may then become, to the student, a culmination rather than a commencement—a happy concentration of elements that he had met earlier, one or two lines at a time. Or the dialog may remain as the starting point. In any case, the social and topical dimensions of the lesson have been 'customized' in an orderly way, and all three dimensions converge on a set of demonstrable non-linguistic objectives. ”
