We would like to add a button to each entry of the search results of our online catalog. For exmaple, if someone is searching for "Harry Potter" through our web catalog, they would get a listing of about 15 items that we have in the library for that. Next to each item, we would like to add a button "Found It" for our study that we are doing to track relevancy in opacs. Any ideas or better yet examples?
Your opac, like any other opac, is an instance of a web application, so you need to modify this particular piece of software. A programmer should know how to add the required button after having looked at the source code of your OPAC. That's the general answer.
Please ask another question if you are interested in alternatives how to track relevancy in opacs, so we don't have to mix independent issues (first which method to use, and second how to implement one particular method) in one question!