Consider carefully what area of land is to be covered by the fieldwork. The ideal is that the work will result in a detailed and intensive study of the area.
If the project is to concentrate on one particular site, the area may be self-evident, but in parish surveys this needs to be considered.
For an individual worker, one or two parishes, depending on their size, is probably the maximum area for detailed work.
For a group of ten or twelve people, five or six parishes would be the ideal area.
Although the area of work must be restricted in order that the work can be carried out properly, remember that the work must take into account the geographical and historical setting of the wider area in which the project is situated.