It is to construct a circuit to bring water from the starting point to the end point, by opening or closing valves and / or connecting pipes between them.
The three levels of increasing complexity in order to promote the development of simple strategies first and then asking to plan and schedule changes in strategies to achieve the final goal.
Easy level: find a logical sequence (selective attention)
Middle level: attentional task complicated by the variety of elements (divided attention and / or dual task)
Difficult level: it will also check the logical and attentional abilities of the patient (distractors elements).