As a rule, conventions only become conventions if they work.

It doesn’t matter how many times I have to click, as long as each click is a mindless, unambiguous choice.

Designers love subtle cues, because subtlety is one of the traits of sophisticated design. But Web users are
generally in such a hurry that they routinely miss subtle cues.

Your objective should always be to eliminate instructions entirely by making everything self-explanatory, or as close to it as possible. When instructions are absolutely necessary, cut them back to a bare minimum.

If you want a great site, you’ve got to test. After you’ve worked on a site for even a few weeks, you can’t see it freshly anymore. You know too much. The only way to find out if it really works is to test it.

When speaking of disabilities, the blind and their needs are most often used as an example. It is deceivingly simplistic since accessibility is something most of the population can benefit from. We all benefit when we are tired, in bright sunshine with a mobile, are forced to use a gaming mouse with too-high sensitivity or receive the text version of video clips when we have forgotten our earphones and are in a quiet environment.