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Task as a pedagogic and research tool has originally been used to elicit unscripted data to be used as evidence for interlanguage processes or as a basis for channelling the learners’ cognitive and linguistic resources to achieve desired learning outcomes. One of the central issues surrounding task-based instruction is the difference between what is planned as task pedagogic goals through manipulation of its design features and what ultimately emerges from the implementation process. The disparity has been attributed to the redefinition of the task by the learners to suit their learning goals (see Hosenfeld, 1976 Breen, 1989). Though this account can explain the gap from the learners’ perspective, it ignores the mediatory role of the teacher and his/her reinterpretation of the task to suit pedagogic goals which may not necessarily coincide with those of the task designer. This paper argues for a redefinition of the teacher’s role in task-based instruction using naturalistic data taken from a larger database of recorded and transcribed lessons. The paper concludes with the discussion of the implications of the suggested role redefinition for task-based syllabus design.