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A common suggested treatment for verbal apraxia is repetition, and the use of slow speech. The required slow speech may be attained by time-scaling ordinary-speed speech. However, when used for this purpose, the quality of the expanded speech must be of a very high quality to be of pedagogical benefit. This paper describes a new method of time-scaling based on the knowledge of speech characteristics, the relative durations of speech segments, and the variation of these durations with speaking rate. The new method achieves a high quality output making it suitable for use as a computer-assisted speech therapy tool.