Whether they are blacksmiths, basket makers, carpenters, or stonemasons, the salaried workers of the Guédelon construction site must, according to their employment contract, occupy part of their working time explaining their activities to visitors. They also must be able to describe the construction site itself, for example the use of cut or squared stones, the height of the towers, the details of the more ostentatious worked parts, etc. This overall knowledge is important as it contributes to the coherence of both the material and architectural aspects of the castle.