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Of course the best metric would be a happiness of your users.
But what metrics do you know for GUI usability measurements?
For example, one of the common metrics is a average click count to perform action.
What other metrics do you know?
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An understanding of the five characteristics of usability – effective, efficient, engaging, error tolerant, easy to learn – helps guide the user-centered design tasks to the goal of usable products.
Usability is a measure of how well a specific user in a specific context can use a product/design to achieve a defined goal effectively, efficiently and satisfactorily. Designers usually measure a design's usability throughout the development process—from wireframes to the final deliverable—to ensure maximum usability.
Completion Rates: Often called the fundamental usability metric, or the gateway metric, completion rates are a simple measure of usability. It's typically recorded as binary metric (1=Task Success and 0= Task failure). If users cannot accomplish their goals, not much else matters.
Jakob Nielsen has several articles regarding usability metrics, including one that is entitled, well, Usability Metrics:
The most basic measures are based on the definition of usability as a quality metric:
- success rate (whether users can perform the task at all),
- the time a task requires,
- the error rate, and
- users' subjective satisfaction.
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