Performance improvement is a consequence of task relevant feedback. Information that is available to the athlete before, during and after a skilled performance can take many forms and is the product of an extremely sophisticated multi-level feedback mechanism. Several researchers have defined and delineated this mechanism for the practitioner. Magill (1993) offered perhaps the most useful classification of feedback processes. A simple hierarchical family tree describes what Magill terms the "feedback family" (see Figure I). Whereas sensory feedback encompasses internally generated information, augmented feedback enhances these sensations by providing external information to the athlete.