I'm working on a search engine for bibliographic data, and I'm trying to understand the use cases for an advanced search feature. Typically seen on the web, this feature will search specific fields (instead of all fields), like Title, Authors, Publisher, Year, etc..
The first use case that comes to mind, is when a user is looking for a specific record, and knows some or all of the information. Using the advanced search will increase the accuracy that the search engine returns the result they are looking for.
Are there others?