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5.6 Executive Process-Interactive Control (EPIC) Model
EPIC model is a cognitive design for modeling human, multimodal, and multiple-
task performance. This model is useful to examine the system or interface speed of
processing, working memory capacity, dual-task performance, and other cognitive
abilities change by age. This model was developed by Kieras and Meyers for
modeling human cognition and performance (Kieras and Meyer 1997 ; Meyer et al.
2001 ). EPIC model contains peripheral sensory-motor processors surrounding a
production rule cognitive processor and is used to construct pr
cise computational
é
models for a variety of human
computer inaction situations.
EPIC model has several elements, namely (Kidder et al. 1999 ) modal stores,
control store, tag store, and storage capacity.
-
The modal stores contain visual, auditory, and tactile stores that contain coded
information from modality-speci
￿
c perceptual processors.
Control store contains the following:
￿
goals (assist to perform particular tasks);
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steps (assist users to complete their job in a sequence manner);
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strategy notes (to enable or disable rules for alternative task strategies);
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status notes (indicate the current state of various processes).
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Tag store includes labels that assign speci
c roles to modal-store items.
￿
Storage capacity is focused on task storage and there is no limit of stored items.
￿
Finally, this model is very useful to assess human performance limitations
toward the interface/software design from low levels of speci
c interaction tech-
niques and at high levels of systems that support complex task performance in
multimodal time-stressed domains (Kieras and Meyer 1997 , p. 394) (Fig. 5.3 ).
 
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