What tools do you use to check if your site is working for your users? How do you use that knowledge to plan improvements? And how do you measure improvement over time? This talk provides a introduction to testing users’ experience with your site. We will start with an overview of user testing best practice. Using examples, we will review a number of approaches and tools you can use to identify problem areas. We will conclude with a list of user-centred optimization strategies that highlight when each tool is most helpful.