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'''Human processor model''' or MHP (Model Human Processor) is a cognitive modeling method used to calculate how long it takes to perform a certain task. Other cognitive modeling methods include parallel design, [[GOMS]], and [[KLM (human-computer interaction)]]. Cognitive modeling methods are one way to evaluate the usability of a product. This method uses experimental times to calculate cognitive and motor processing time. The value of the human processor model is that it allows a system designer to predict the performance with respect to time it takes a person to complete a task without performing experiments. Other modeling methods include inspection methods, inquiry methods, prototyping methods, and testing methods.
The standard definition for MHP is: The MHP draws on an analogy between the processing and storage areas of a computer, with the perceptual, motor, cognitive and memory areas of the computer user.
The human processor model uses the cognitive, perceptual, and motor processors along with the visual image, working memory, and long term memory storages. A diagram is shown below. Each processor has a cycle time and each memory has a decay time. These values are also included below. By following the connections diagrammed below, along with the associated cycle or decay times, the time it takes a user to perform a certain task can be calculated. Studies into this field were initially done by Card, S.K., Moran T.P., & Newell, A. (1983). Current studies in the field include work to distinguish process times in older adults by Tiffany Jastrembski and Neil Charness (2007).
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