In Denmark, 13 interviews were conducted in a dense arable farming region in central Jutland involving traditional cash crops like wheat, barley and rape seed. In Greece, 17 interviews were carried out in Thessaly in central Greece, which is the major agricultural region in Greece with the larger fields and larger farm machinery complements and with farm managers/machinery operators cultivating arable crops (cotton, durum wheat and corn). As a follow up to evaluate the proposed conceptual developed models, 15 interviews with a subset of the initial reviewing panel was carried out in the summer of 2014.