Report and Calculator Package
72 of the most common questions and answers for dealing with quantifying the user-experience such as what measures to take, dealing with small sample sizes, confidence intervals, questionnaires and task-times.
Problem Frequency Calculator
Most usability activities are on small sample early designs. During this stage it is helpful to know what percent of users would likely encounter a problem in a design. It is also sold separately as the Problem Frequency Calculator .
Average Task Time Calculator
Efficiency is an important component of usability and task-time is the best way to measure efficiency. This calculator deals with the non-normally distributed nature of task times and gives you the best estimate of the average task time and confidence intervals around this average. It is also sold separately as the average task time calculator.
Completion Rate Confidence Intervals
From early design to benchmark studies, completion rates are a fundamental metric of usability: can the user complete the task? This calculator provides confidence intervals around the most likely completion rate from any sample size.
Questionnaire Data Confidence Intervals
Rating scale questionnaires are a common way of asking users how they perceive the usability of a website and this calculator will provide the confidence intervals around the average rating. It can be used for single questions or aggregate scores such as those from the System Usability Scale.