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We have observed programmers at work using existing interactive systems in an IBM research environment. Our observation of the use of language processors indicates that users of TSS/360 seldom need the interactive error-correction features of the language processor. Also, when a user might use such features, he seldom does. By implication, these observations also point to the importance of implementing SIPE-type data collection systems. We have presented our observations of the relationship between system response time (SRT) and user response time (URT). The results indicate that a long SRT is related to a long URT. This suggests that ways be sought to reduce the undesirable effects of a long SRT and to reduce the SRT-URT interaction without adding to the cost or complexity of the system.
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