The group tours are designed for flexible travellers who wish to meet new people. The tour follows a set itinerary, but it is possible for each traveller to join the tour at any point after it begins. The basic requirement is that each group ultimately contains the minimum number of participants, typically three. The cost of the tour is determined by the number of participants. Group tours are less expensive than private tours, since the administrative costs are divided between the participants. However, group tours, unlike private tours, cannot be personalized; they must adhere to the itinerary and the quantity of information established beforehand.