3. the interaction

EXERCISE 3.12 [extra - not in book]

This question relates to the train both scenario.

Define slips and mistakes and provide an example of each while interacting with the train booth.

answer available for tutors only

Slips are right intentions which users fail to do right, mainly due to poor physical skills, inattention or fatigue.

Example: Selecting the wrong destination from the list of those starting with the destination’s letter, e.g. the one beneath or above, due to poor coordination.

Mistakes are caused by incorrect understanding of how the system works, e.g. inaccurate mental model.

Example: The attempt to type in the entire name of the destination, and not only the first letter.

Other exercises in this chapter

ex.3.1 (ans), ex.3.2 (ans), ex.3.3 (ans), ex.3.4 (open), ex.3.5 (open), ex.3.6 (tut), ex.3.7 (tut), ex.3.8 (open), ex.3.9 (tut), ex.3.10 (open), ex.3.11 (tut), ex.3.12 (tut)

all exercises for this chapter