ABSTRACT
Task analysis for error identification (TAFEI) is a method that enables people to predict errors in the use of a device by modeling the interaction between user and device. It assumes that people use devices in a purposeful manner, such that the interaction can be described as a “cooperative endeavor,” and it is by this process that problems arise. Furthermore, the technique makes the assumption that actions are constrained by the state of the product at any particular point in the interaction, and that the device offers information to the user about its functionality. Thus, the interaction between users and devices progresses through a sequence of states. At each state, the user selects the action most relevant to his/her goal, based on the system image.
