MONITORING PLACES OF DETENTION : A PRACTICAL GUIDE 72 2.5.2 Size The size of the visiting team depends on a number of factors, for instance: ■ the objectives of the visit; ■ how much is already known about the place and its problems; ■ the size of the establishment and the number of persons held there; ■ any constraints laid down by the detaining authorities. The ideal size for a visiting team can be estimated as being between 2 and 8 people. 2.5.3 Training Monitoring places of detention is a difficult and sensitive task. It is therefore particularly important for the members of the visiting mechanism to receive adequate training, of both a theoretical and practical nature. Training should continue throughout the term of office. Theoretical training should include at least the following: ■ the basic principles of monitoring, in particular confidentiality and the necessity to always bear in mind the security of the detainees; ■ the legal framework, in particular the relevant international standards, national laws and regulations; ■ key issues and problems relating to the deprivation of liberty. Practical training should include at least the following: ■ the methodology of visits;