A practical guide to usability testing pdf

For example, after observing and interviewing users, the usability expert may identify needed functionality or design flaws that were not anticipated. Usability describes the quality of user experience across websites, software, a practical guide to usability testing pdf, and environments. Studies of user behavior on the Web find a low tolerance for difficult designs or slow sites.

People don’t want to wait. And they don’t want to learn how to use a home page. There’s no such thing as a training class or a manual for a Web site. People have to be able to grasp the functioning of the site immediately after scanning the home pageā€”for a few seconds at most.

Otherwise, most casual users simply leave the site and browse or shop elsewhere. The extent to which a product can be used by specified users to achieve specified goals with effectiveness, efficiency, and satisfaction in a specified context of use. The word “usability” also refers to methods for improving ease-of-use during the design process. How easy is it for users to accomplish basic tasks the first time they encounter the design?

Efficiency: Once users have learned the design, how quickly can they perform tasks? Memorability: When users return to the design after a period of not using it, how easily can they re-establish proficiency? Errors: How many errors do users make, how severe are these errors, and how easily can they recover from the errors? Satisfaction: How pleasant is it to use the design? Each component may be measured subjectively against criteria, e. Principles of User Interface Design, to provide a metric, often expressed as a percentage. It is important to distinguish between usability testing and usability engineering.

As with other non-functional requirements, usability cannot be directly measured but must be quantified by means of indirect measures or attributes such as, for example, the number of reported problems with ease-of-use of a system. Instead, he advocates the term “intuitable,” i. He continues, however, “But even that is a less than useful goal since only 25 percent of the population depends on intuition to perceive anything. It details the advantages, disadvantages, and other factors relevant to using each usability method. It explains the implications of the stage of the life cycle and the individual project characteristics for the selection of usability methods and provides examples of usability methods in context.

It therefore addresses technical human factors and ergonomics issues only to the extent necessary to allow managers to understand their relevance and importance in the design process as a whole. TR 16982:2002 can be tailored for specific design situations by using the lists of issues characterizing the context of use of the product to be delivered. Selection of appropriate usability methods should also take account of the relevant life-cycle process. TR 16982:2002 is restricted to methods that are widely used by usability specialists and project managers.

As part of this change, ISO is renumbering some parts of the standard so that it can cover more topics, e. The first part to be renumbered was part 10 in 2006, now part 110. The design team should be user-driven and it should be in direct contact with potential users. Usability considerations, such as who the users are and their experience with similar systems must be examined. As part of understanding users, this knowledge must “be played against the tasks that the users will be expected to perform.