Here a quick example: a design software provides 3 different drawing shapes: rectangles, ovals and text boxes (objects). In other words, a user interface will be consistent as long as same actions and attributes apply to the same conceptual objects. The time and effort required to learn a feature is directly proportional to the number of actions and attributes this feature will entail and how much those actions and attributes will differentiate from the others. The more consistent a user interface is, the more predictable will be the results of the user's action (and the higher the opportunity to bridge the gulf of execution and evaluation). More precisely, the consistency of an interactive system affects how quickly a user progresses from conscious, monitored and slow operation (the so-called system two of our brain) to unconscious, unmonitored and quicker process (the so-called system one of our brain). But, why is consistency so important and where does it come from?Ĭonsistency is a crucial factor which affects human learning. In 2009 Shneiderman and Plaisant combined their set of guidelines and came up with the rule "strive for consistency". Since 1990, Nielsen and Molich have included "consistency and standards" at the top of their 10 heuristic rules. HOW DOES A USER INTERFACE ACHIEVE CONSISTENCY? | The 2 dimensions of consistency you need to consider.Ĭonsistency is one of the most well-known and recognised UI principle.
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