Posts by Paul Olyslager


Usability testing is a technique used to evaluate a product, such as an application, website, book etc. by observering people using it. The goal is to discover usability problems, collect quantitative data (e.g. time on task, error rates), and determine the participant’s satisfaction with … continue reading

A couple of weeks ago I launched a contest with, in my humble opinion, a great price: an ebook bundle of Smashing Magazine about Usability and UX for Web Design. Today, the ebook bundle contest has concluded. For those who have participated, thank you for competing and spreading the word. This is the time you’ve… continue reading

To celebrate the arrival of the cold but cozy Christmas Holidays, I’m giving away two ebook bundles of Smashing Magazine. Each ebook bundle contains 6 ebooks about Usability and UX for Web Design. What better way to start your Christmas holidays by winning this valuable price! Editorial note: The contest has concluded. Find out if… continue reading

The last couple of weeks I’ve been experimenting with Optimizely, a testing tool founded by two former Google product managers, trying to optimize the conversion rate of this blog with the help of a multivariate test. Multivariate tests, also called multivariable tests, provide insight into which content or creative variation produces the best improvement in… continue reading

Like many of us, I have read a lot of articles containing endless bullet points about how to improve a Web site’s usability. Unfortunately I rarely come across a post bringing up text layout or typography (heck, I even forgot about it in my previous posts) and when it does it seems to be limited… continue reading

I'm the creator and editor of, a blog about on Web Design, User Experience and Usability. Currently I'm working as UX Manager for a leading supplier of nutrients and supplements to the European market based in Berlin, Germany. Follow me @paulolyslager or google+.