Description
I think the web-based search interface is misleading in a way that will frustrate users. The search is progressive, but this isn't advertised, and users are not accustomed to it. If a newbie issues a query, gets some results, and realizes from the results that she is searching for the wrong thing, then she is going to enter a new query value and try to search again. She'll see either a) a yellow warning bar saying "No matching studies found", followed by the list of studies that were found (in the previous query), or b) a result list that is only a subset of what she really wants, because its a subset of the earlier botched query.
This isn't an imaginary example. It happened to me when I first tried the new query interface. Then it happened to me again because I forgot what I had learned the first time.
I didn't see the "Discard all Results" button because I wasn't looking for it, and because its at the bottom of the list, which means that if you get more than 3 or 4 hits, its going to be below the browser pane and invisible.
I would suggest to make each search independent, i.e., clear the results with each new query, rather than using a progressive search. Alternatively, the messages could be more informative and the "discard" button could be put at the top of the list. In any case, it wouldn't hurt to widen the layout and abbreviate the titles so that the results list takes up less space.
Reported by: astoltzfus