Characteristic Elements of User Interaction Scenarios

Scenario Element Definition Examples
setting situational details that motivate or explain goals, actions, and reactions of the actors office within an accounting organization; state of work area, tools, etc. at start of narrative
actors humans interacting with the computer or other setting elements; personal characteristics relevant to scenario accountant using a spreadsheet package for the first time
task goals effects on the situation that motivate actions carried out by actors need to compare budget data with values questioned in memo
plans mental activity directed at converting a goal into a behaviour opening the memo document will give access to the memo information; resizing one window will make room for another
evaluation mental activity directed at interpreting features of the situation a window that is too large can be hiding the window underneath; dark borders indicate a window is active
actions observable behaviour opening memo document; resizing and repositioning windows
events external actions or reactions produced by the computer or other features of the setting; some of these may be hidden to the actors but important to the scenario window selection feedback, auditory or haptic feedback from keyboard or mouse, updated appearance of windows

from Rosson and Carroll's Usability Engineering (2002), p. 18