A data retrieval system provides data to a user of a client computer connected to multiple data stores and multiple other computers. A request for data is received at the client computer. The request is forwarded from the client computer to a server computer and intercepted at a reverse proxy caching connection. An attempt is made to locate the data at a data store at the reverse proxy caching connection. If the data is not found the request is forwarded to the server computer. In order to provide data to a user. A user interface is provided. Initially, data elements associated with a grouping of data elements are identified. Then, a subset of the selected data elements are selected based on weights associated with the data elements, without selecting more than a specified number of data elements that are associated with a same sub-category.