Even the most optimistic portraits of discovery platforms, however, hint at shortcomings. These include lack of all but the most basic interface customization, lack of complete coverage of all library resources, high cost, and some usability problems.It is also uncertain where discovery platforms fit among the broader set of information resources that libraries provide. Inexperienced library users already struggle to disambiguate various types of resources.Further research is needed to determine whether combining heterogeneous resource results into a single results list helps or hinders library users as they navigate the library resource environment. Libraries must think carefully about how to present discovery platforms along with everything else they provide, including those tools that overlap in functionality, such as the catalog and specialized article databases.