Exploratory field research (by means of drilling) is often carried out in combination with a desk research. The goal is to check the expected archaeological value of a project site with reality.
During the exploratory phase, one tries to gain an insight into the soil structure and possible soil disturbance. If the soil is (largely) intact and there is a chance of archaeological remains (based on location models), it is advised to perform a soil survey. If the location of archaeological remains is known, an archaeological evaluation may be carried out immediately, thereby saving the cost of a soil survey.