The movie Glengarry Glen Ross taught us Always Be Closing. In the world of web design, the mantra is Always Be Testing.

Yet, it’s not always clear how to go about testing your site or how to know what exactly you’re testing for. Fortunately, we’re here to provide the who, what and why of usability testing.

 What is Usability?

Before we examine the components of website usability testing, let’s define it. Jakob Nielsen says:

Usability is a quality attribute that assesses how easy user interfaces are to use. The word "usability" also refers to methods for improving ease-of-use during the design process.

Usability experts agree that usability testing includes the following five components:

  1. Learnability: How easy is it for users to accomplish basic tasks the first time they encounter the design?
  2. Efficiency: How fast can experienced users accomplish tasks?
  3. Memorability: When users return to the design after a period of not using it, does the user remember enough to use it effectively the next time, or does the user have to start over again learning everything?
  4. Errors: How many errors do users make, how severe are these errors and how easily can they recover from the errors?
  5. Satisfaction: How much does the user like using the system?

Why is Usability Important?

The goal of usability testing is to identify any usability problems, collect quantitative data on participants' performance (e.g., time on task, error rates), as well as determine user satisfaction with the website.

Put simply, if a website is difficult to navigate or doesn’t clearly articulate a purpose, users will leave. Making it so they don’t leave, makes testing websites a necessary task.

For some, usability testing can seem daunting, but it can be done fairly easily if you know how. Of course, it’s also a process that can be comprehensive and costly if you don’t know what you’re testing for or what you’re trying to discover.

Monitoring usability can even be misconstrued as a waste of time by some, but Gerry McGovern assures us that

The biggest challenge a website manager has is to understand how humans work, not how content management software or search engines work.

By measuring the previously mentioned five components, you can learn how easy your site is to master or more importantly, how easy it isn’t. By gathering this data, you can help evolve your website into a more user-friendly site, which ultimately can affect your business’ bottom line.

Tasks First, Design Second

Ideally a well designed site means that users not only get treated to a pretty interface, but they are also treated to an interface that's easy to navigate and information that helps the user complete a specific task, whether it's buying shoes or reading local news. Yet, websites, no matter how graphically pretty, don't always make it easy to complete these tasks.

Gerry McGovern (via an interview with Jared Spool) says that in order to meet the needs of the users, making task completion must be the primary objective for designers.

"Don't manage the technology; don't manage the content; don't manage the information; and don't manage the graphics," Gerry says, "Manage the tasks."

Once the task is established, design, technology and content fall easily into place. For sites that didn't design with the task at the top of their list, usability testing is especially important.

When Should You Test and How?

Always Be Testing. No website is perfect, but every website should be evolving. User behavior can change depending upon the age, experience and interest of a user.