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Figure 10.16. Extract from the film of the direction search experiment
We therefore have L O = 2. Let us now assume that the user travels the following
path:
1 → C, C → D, D → E, D , E → D, D → C, C → B
In this case, L U = 7. The relative length L R of this path is therefore L U / L O = 7/2 =
3.5. This relative length enables any path traveled to be compared with the
optimum, without the distance between the start and end points coming into play.
We therefore judge that it is a good metric for comparison between different
experiments.
10.8.2.2. Experiments with a user
In these experiments, a single user at a single point in time was looking to find
his way.
Control experiment. In this experiment, the screens only displayed information
concerning the platform that corresponded to them (Figure 10.17). The results are
given in Table 10.4. We can observe a great disparity in results:
- When the user goes from one of the extremities of the corridor (landmarks 0 or
2) the average relative length is 1, which shows that in this case the journeys are
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