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Level of complexity
functional category
low
The expected user can perform the required task easily, almost no additional teaching/ learning is required.
medium
Additional learning and teaching are required, however, most of the tasks can learn by oneself.
high
Additional learning and teaching are required. The user can still learn the task on his own, however, he may have difficulty in self-study.
extreme
Additional learning and teaching are essential, professional knowledge and years of experience are required to perform the designed task, and users are not required to use the product without directions of the experties.
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