Và một người có thị lực kém có thể không nhìn thấy các trang web, nhưng sẽ nghe nó đọc to thay vì. Đối với các nhà văn web mới và dày dạn và nhà thiết kế như nhau, điều này là bài học quan trọng nhất để tìm hiểu tất cả các điểm của Web là duy nhất, và tất cả các điểm của trang web phải là duy nhất. Đây không phải là | USABILITY 77 The easiest way to build a site that s usable on the operational level is to let users be sloppy. Prefer large clickable areas on links navigation items and images. A test I often do is to see if I can mouse over page controls by moving my mouse with my elbow which offers less control than my hand. Provide high-contrast text run in a comfortably large font with the ability to increase the font size further without breaking the page s layout perhaps by employing DOM scripting see Chapter 19 . If users can be sloppy that is if they aren t constantly encountering breakdowns they can better focus on their goals and actions. FOUR QUICK BUT USEFUL MINI USABILITY TESTS Stephen Krug s book Don t Make Me Think is a great resource for conducting your own basic usability tests I especially recommend his chapter Usability on 10 Cents a Day . One of the things that Krug recommends is iterative testing don t just test once but test make changes and test again even if it s on the same friend or colleague who s agreed to help you out .9 It s also important to test throughout your design process if possible. With your improvements a second and third and fourth round of testing will reveal other issues that were missed the first time around. Here are some simple usability tests which are oriented around the four information-seeking behaviors above Finding everything that there is. Most usability tests begin by showing a user the site you want to test. But the usability of a site particularly for an everything-seeking behavior actually begins in a search engine. This test which is only effective on sites that have been indexed by Google and other search engines asks users to begin from a Web search. Provide a few different scenarios for users You re an employer seeking resumes of people in my profession You re a college freshman looking for information about the chess club. Watching what sites they click on and asking why can provide insight for how you should structure
