title: Best practice for multiple selection web UI?
body: <p>I've been looking at various ways to allow a user to select one or more choices from a list of approximately 29-30 options. I've come up with the following four types, and wonder which is preferred/most usable. See <a href="http://workingstorage.com/multiple%20selection.png" rel="nofollow noreferrer">http://workingstorage.com/multiple%20selection.png</a></p>