Adding content to knowledge base will go quicker if you know what your users need. So, the search form implemented by the GD Knowledge Base Pro plugin will track every time user searches the knowledge base. Search string, the number of results, the source of the search form, location and other things will be logged.
Most important thing logged is the list of actual clicks on the results returned by each search results set. This way, you will know if the search for a specific string is successful or not, and if it is not, you can work on adding new content that will target the search query that has failed.