Computer-implemented systems and methods are disclosed for displaying a number of data items within a graphical user interface. Data items retrieved from a data store (e.g., a database) may be assigned, based on a first predetermined criterion, to first level bins. A first level bin identifier is associated with each first level bin. One or more first level bin identifiers are displayed in a list within a graphical user interface. Upon user operation on a displayed first level bin identifier associated with a particular first level bin, data items contained in the particular first level bin are displayed in the list.