PEOPLE WHO TEACH golf, skiing, and tennis have known for years that nothing speeds the learning process like showing someone a tape of themselves trying to perform a test of skills. The subjects of these revealing videos study every move and every nuance with uncommon attentiveness, because they are, after all, watching themselves—and they don’t always like what they see.

The same is true for the role of the TV camera in helping people (1) see themselves as others see them, (2) spot distracting body movements or gestures, (3) practice for speaking assignments, (4) perfect key elements like pauses and eye contact, and (5) monitor their own progress and improvement as they advance through a program like mine to develop their ...

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