Audio interfaces for mobile and wearable computing are in an early state of development. User studies concentrate on the usability of audio interfaces as means of interacting with a device but leave out the question of how an audio interface can aid at performing a main task. Studying the impact of audio interfaces in computer aided tasks for wearable and mobile computing will provide guidelines for hands-free interface design and information presentation. To be able to measure the performance

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... simulated main task is used where varying mental loads can be setup. Providing an index of difficulty for the simulated task, users studies will reveal how effective an audio interface can be used to convey information to aid at a task.