TL;DR: SUS is a very reliable measurement of a system’s perceived usability. It uses 10 questions, graded from strongly disagree to strongly agree, to measure perceived usability and learnability. With a sample size of 12 the results have an accuracy of 100%. A big amount of effort is attributed to uncovering usability issues of a […]

User-centred design, user-centred approach, user-driven development, user-centric organisation, are all trying to describe the same phenomenon. An entity which performs design for a product,  with high-priority consideration and constant input of the person who will use it. Furthermore, we see everyday more and more organisations converting themselves to being user-centric. So the question appears, what […]

TL;DR: For creating a legible text use font size of 18 pixels or larger, with line spacing of at least 120% —with larger line spacings being more likeable. Adding at least some margin around the text, makes it more preferable. Deciding which font size to use can be an endeavour. Whether deciding for a blog […]

TL;DR: Promo codes help visitors save money and increase sales for people already interested. Adding a promotional code to a design increases the likelihood of process abandonment, as people may wander off to another website in search of the code. Visitors that have a code could be more satisfied with their purchase, while those who […]

TL;DR: Use a looped animation for waiting times between 2000ms and 10000ms. A progressbar is best to be used for waiting times from 10000ms to 30000ms. When the expected waiting time is more than 30000ms (half a minute) show a progress bar and a time-to-complete estimation, to inform the visitor when to come back. Looped […]