Posted on: 11 July 2013
Ph.D - Chief Experience Officer
How to determine if your design is ‘easy to use’
Good design depends on whether or not users “get it” and the only way to evaluate if you successfully communicated how the design works is by measuring the product usability.
The ISO 9241-11 Standard Evaluates Product Usability Along Three Criteria
Sometimes called utility, usefulness, regardless of the label the basic question to answer is “does the system support the user in achieving their goals?”
After have determined that the user can achieve their goals, you might to ensure that goals can be completed as quickly as possible, with a few errors as possible
Finally, a usable system should also be a positive experience
The method for measuring usability has a straightforward name, a usability test. A usability test will help you determine if your user interfaces are “easy to use”, and if not, provide you insights into why users struggled.
Basic Steps that are Part of a Usability Test
In most cases you don’t need a lot of participants, 5 is usually fine for usability testing, but what is more important is that you have to test it with actual users. Having someone from a different department is not a reliable study, so make sure you are recruiting the right users for your test by taking the time to create a recruitment screener.
Usability test is an experiment, so you will need to create a test plan and script to ensure that every participant is given the same instructions, and level of support, otherwise it will be difficult to draw conclusions.
In a usability test, while participants are completing the tasks from the protocol, you will need to capture their performance for analysis. The amount and types of data you collect will be determined by the objectives of the testing. Performance data (for example; time on task, error rates) will determine if the design meets business requirements, while screen and audio capture provide richer insights on user behaviour. If a participant indicates that they didn’t like something with the design, probe to try to find out why.
Time to crunch the data and see what insights fall out from the usability test. Unless you ran a large number of participants don’t try to run of the more complex experimental statistical methods. Instead, look for trends, errors or behaviours demonstrated by 3 or more participants.
At the end of the data analysis you will have evidence to back up your design decisions, a list of issues and concerns to tackle for further product improvements and then it’s time to start getting ready for the next round of testing. From recruiting to analysis, the testing process could take as little as 2 weeks, which is not very large investment of time or money, but can have a significant impact on your chances for success.
Ph.D - Chief Experience Officer
Dan firmly believes that technology must be created with the user in mind. Never shy to critique a bad design, Dan uses the Akendi blog to shine a spotlight on usability mistakes…and their solutions. Leveraging his background in engineering, computer science, psychology, and anthropology, Dan offers a unique perspective on the latest UX trends and techniques.