Method of and system for reducing data entry errors that ascertains a subset of keys that can be selected by a user based upon the respective likelihood that each key follows a previously selected key within a predetermined language, corpus, or subset thereof, and controls the display of the keys within an input device so that the keys within the ascertained subset are displayed in a visually distinguishable manner from the keys that not within the ascertained subset. In a touch screen device, the keys that are displayed are part of the soft keys displayed on the screen. In a system that includes an actual physical keyboard, the appearance of select keys of the keyboard can be modified in various manners, including the use of an LCD display or other controllable lighting mechanism disposed within the keyboard. Multiple additional techniques for reducing data entry also are disclosed.