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The last two decades in applied linguistics—which roughly coincide with the evolution of the communicative approach in language teaching—have seen the development of a number of language teaching innovations, including the notional/functional syllabus, the process syllabus, the Natural Approach, the procedural syllabus, and task-based language teaching. All of these proposals have contributed in important ways to an understanding of theoretical issues related to designing innovative language syllabuses. But it is only rather recently that applied linguists have begun to investigate the problems associated with implementing these innovations.
Numa Markee (Sun,) studied this question.