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"Monotony is the dual of modelessness in an interface. ln a modeless interface, a given user gesture has one and only one result: Gesture g always results in action a. However, there is nothing to prevent a second gesture, h, from also resulting in action a. A monotonous interface is one in which any desired result has only one means by which it may be invoked: Action a is invoked by gesture g and in no other way. An interface that is completely modeless and monotonous has a one-to-one correspondence between cause (commands) and effect (actions). The more monotony an interface has for a given task space, the easier it is for the user to develop automaticity, which, after all, is fostered by not having to make decisions about what method to use."
