System-user Interaction Modeling

A user interface defines the framework for system-user interaction. That is, both the user and software only have predefined and limited choices for how they can proceed. More importantly, a user interface knows exactly when a user delay will occur and provides critical information for how long it will last. In this section, we utilize the STD model [27] to use such knowledge. In the next two sections, we propose models to predict the length of user delays based on this knowledge.