![]() ![]() The ISO 9241-11 standard defines usability as “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 ISO/IEC 9126-4 approach to Usability Metrics I personally prefer this approach because it introduces the main usability metrics in a very structured manner rather than a haphazard collection of disjointed metrics. In this article I will explain the ISO (International Organization for Standardization) recommendation of what constitute the key metrics for evaluating the usability of any system. Naturally, the questions that come to mind are …“Which metric shall I use?”, “How shall I obtain the components needed to calculate it?”, “Is this metric reliable enough to give a realistic picture of the degree to which my system is usable (or not)?”. ![]() Just one quick look at the results of the first 2 pages of the SERP is sufficient to notice that there is a general disagreement with regards to what constitute the key usability metrics. Since there are several quantitative data sources that one can measure, it is very easy to become immersed in a distracting black hole of data that is interesting but lacking any actionable insight.Ī Google search for ‘ usability metrics’ yields no less than 9.3 million results. Usability is generally measured using a number of observable and quantifiable metrics that overcome the need to rely on simple intuition. Ultimately, the primary objective of usability metrics is to assist in producing a system or product that is neither under- nor over-engineered. If you’re not fully experienced in Usability Testing, then you should first take an online course on Usability Testing and re-examine a definition of Usability. Thirdly, you need to use metrics when you do Usability Testing.Secondly, you can use metrics to compare the usability of two or more products and to quantify the severity of a usability problem.Firstly, the most common reason is the need to effectively communicate with the stakeholders of the system you’re evaluating.There are many reasons why you would measure usability. Metrics come in very handy when it comes to quantify usabilityduring the usability evaluation of software, websites and applications. A metric is a “ system or standard of measurement” represented in units that can be utilized to describe more than one attribute. ![]()
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