Abstract: A data input device and method of encoding key assignments for a data input system which provides for the mapping of the numerous keys, alpha, numeric, symbolic and function, found in a full-sized standard keyboard into ten data input keys. The data input system aids in reducing clutter associated with data input by incorporating all input functions to a minimum of keys. The data input system, whether depressed through a single stroke or combination, evolves data input from a complex system requiring numerous keys laid out in an unwieldy fashion into a system of single finger keys which are actuated in simple combinations. In practice, each key in the primary ten data input key of the present invention acts as a “shift key” creating user options when first depressed. Pressing a subsequent key or keys or releasing the initial depressed key will cause the desired character or function to occur.