"Monotony" here is a technical term meaning that you do not have to choose among multiple gestures to achieve a particular sub-task. To make an interface habituating, it must be monotonous. In the presence of modes, you will sometimes make mode errors, where you make a gesture intending to have one result but get a different and unexpected result, distracting you from your task. Modes exist where the same gesture yields different results depending on system state at a time when your attention is not on system state. To make an interface habituating, it must be modeless. Any interface will have elements that are habituating, but the principle here is to make the entire interface habituating. If the interface can be operated habitually then, after you have used it for a while, its use becomes automatic and you can release all your attention to the task you are trying to achieve. That is not all that is needed, but it is a prerequisite. A understanding of the relevant portions of cognitive psychology, ergonomics, and cognetics is essential. For a more experienced typist, typing the word "the" is a gesture.ĭesigning a human-machine interface demands that both the human and the machine be understood as well as possible. Example: For a beginning typist, typing the letter "t" is a gesture. When using a product to help you do a task, the product should only help and never distract you from the task.Ī gesture is an action that you finish without conscious thought once you have started it. Jef Raskin wrote "The Humane Interface" about the fundamental issues of interaction design for usability of any computer based system.
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