Human-Computer Interaction 3e Dix, Finlay, Abowd, Beale

exercises  -  15. task models

EXERCISE 15.4

(Converse to above) Figure 15.6 uses an HTA diagram to show the actions in which a tractor is involved; show the same information textually.

answer

0.    life cycle of tractor        
    1.    maintenance            
    2.    cultivation            
          2.1.    connect implement    
                  2.1.1    fix harrow  
                  2.1.2    fix plough  
          2.2.    drive to field       
          2.3.    cultivate field      
          2.4.    drive to shed        
          2.5.    put away

Plan 0:    as required --- 2   
           when tractor breaks down --- 1

Plan 2:    2.1 -- 2.2 -- 2.3 -- 2.4 -- 2.5

Plan 2.1:  one of 2.1.1 or 2.1.2 depending on job

Other exercises in this chapter

ex.15.1 (ans), ex.15.2 (ans), ex.15.3 (ans), ex.15.4 (ans), ex.15.5 (ans), ex.15.6 (tut)

all exercises for this chapter


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