The emergence of federated search tools for the library market represents a significant step toward the longstanding goal of a common searching interface in the reference environment.These systems aim to provide integrated access to library resources of all types.This article describes and evaluates federated search tools from four vendors. It suggests criteria that may be useful for libraries attempting to compare and contrast this type of access tool.
The Reference Librarian
Boss, Stephen C. and Nelson, Michael L. (2005). "Federated Search Tools: The Next Step in the Quest for One-Stop-Shopping." The Reference Librarian .44, 139-160. http://dx.doi.org/10.1300/J120v44n91_10