Human-Computer Interaction: Communication, Cooperation, and Application Design

By Hans-Jörg Bullinger; Jürgen Ziegler | Go to book overview
Figure 1 : System components

3 Huey, Dewey and Louie learn how to drive

The first application developed using this approach is a course on driving. In figure 2 some of the tasks that belong to the module on traffic signs are shown. Each row in the table describes a composed task, including: (1) the list of associated subtasks, (2) the subtask sequencing: OR means that only one of the subtasks has to be performed, AND means that they all have to be performed in the prescribed order, and ANY means that they have to be performed, but in any order, (3) a precondition to be satisfied for initiating the task.

TASK SUBTASKS SEQUENCE PRECONDITION
traffic-signs types, priority ANY student-age < 18
traffic-signs types, prio-theory ANY student-age > 18
types agents,semaphores,vertical-signs,
marks, circumstantial-signs
ANY
agents agtheory, agpractise AND
vertical-signs vshape, vmeaning OR
vshape vstheory, vspractice AND student-age > 18
vshape vstheory, vsexamples,vspractice AND student-age < 18
vmeaning vmtheory, vmpractice AND student-age > 18
vmeaning vmtheory, vmexample, vmpractice AND student-age < 18
vstheory circular-signs, square-signs ANY
circumstantial-
signs
ctheory, cpractice AND exer-ok in task
vertical-signs > 3
priority prio-theory, prio-example AND
Figure 2: Sample task decomposition

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