In addition, working load capacity is affected by familiarity. Familiarity has been associated with increased working memory however, since familiarization is created from repetitive experiences, changes in the experiences can lead to errors (Hollands et al., 2002).

The response of humans to menu commands can follow familiar patterns this creates a margin of error especially when there are slight changes in specification of commands. Strain is seen when familiar objects like buttons, joysticks, mouse controls are moved to digital displays and touch screens. For example, the repetitive use of keyboard commands is more effective that menu searches (Hollands et al., 2002). This change offers the same features with different mode meanings that increases the strain on the working memory resources and reduces the ability of cognitive automization of humans (Hollands et al., 2002).

 

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