The research was concerned with the experimental use of Model II of the Instantaneous Pitch-Period Indicator (IPPI) with deaf subjects, and with the design and construction of a portable unit. Deaf adults and deaf children participated in training programs designed to develop more effective patterns of speech using the IPPI for visual monitoring of intonation usage. The deaf adults' study suggested equipment modifications, teaching materials, and research design for the children's study. The children's study revealed that deaf children improved during training with the IPPI, most noticeably during the first 4 weeks of the 8-week program. Resulting data on the sequence of rhythm and intonation learning tasks were incorporated into an expanded training program, and new features were designed and constructed into apportable unit designated as Model III, Instantaneous Pitch-Period Indicator: Amplitude, Intensity, Duration (IPPI-AID). (Author/JD)