可用性度量 Objective Effective Efficient Satisfaction Suitability for the Percentage of Time to Rating scale for task goals achieved complete a task satisfaction Appropriate for Number of Relative Rating scale for trained users power features efficiency satisfaction with used compared with power features an expert user Learnability Percentage of Time to learn Rating scale for functions criterion ease of learning earned Error tolerant Percentage of Time spent on Rating scale for errors corrected correcting error handling successful errors 人机交互技术编写组 5人机交互技术编写组 5 可用性度量 Objective Effective Efficient Satisfaction Suitability for the task Percentage of goals achieved Time to complete a task Rating scale for satisfaction Appropriate for trained users Number of power features used Relative efficiency compared with an expert user Rating scale for satisfaction with power features Learnability Percentage of functions learned Time to learn criterion Rating scale for ease of learning Error tolerant Percentage of errors corrected successfully Time spent on correcting errors Rating scale for error handling