A customizable data filter system is disclosed, that is adapted to reduce the dimension of a searchable data base (100), and to enable performance of a database search and/or a data item selection, in relation to the reduced search space. The system comprises a Portable Customizable data Filter and Interface (PCFI) (204) storing at least a base data filter parameter, and able to provide a user interface by means of user selectable icons. The system also comprises a reader (210) for the PCFI (204), and database processing means (214) responsive to the data filter parameter and a user icon selection, wherein the reduced search space is defined by the filter parameter, and the database search and/or the data item selection is performed using the selectable icons.