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I would say No, not entirely. There is of course the System Usability Scale which measures: effectiveness (can users successfully achieve their objectives) efficiency (how much effort and resource is expended in achieving those objectives) satisfaction (was the experience satisfactory) The measurement coming closest to your question would be ...

In simple terms no. Task complexity can be determined through user testing, preferably using an approach such as contextual enquiry. All scales will be based upon interpreting the user feedback and if a user can successfully carry out a task. Common 'scales' are series of grades ranging from everyone completes the task with no problems through to tasks ...