“SHEL” model : The component blocks of the SHEL model : Software, Hardware, Environment, Liveware). The interpretations are: liveware (human), hardware (machine), software (procedures, symbology, etc.) and environment. Liveware (the human) is at the centre of the model. Human is generally considered the most critical as well as the most flexible component in the system. Yet people are subject to considerable variations in performance and suffer many limitations, most of which are now predictable in general terms. The edges of this block are jagged, and so the other components of the system must be carefully matched with them if stress in the system and eventual breakdown are to be avoided. Physical size and shape. In the design of workplace and equipment, a vital consideration involves body measurements and moveme...
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