Yet, in new prisons in particular, the distance between the various different wings renders meetings difficult between the staff and the actors – as well as between the professionals of the institution – who only come across each other in areas where it is inconvenient (and little advisable) to stop: main entrance, central information post (PCI) and information and control post (PIC). As Grégory Salle234 points out, it is interesting to examine the statements made by professionals having worked in these institutions of a different design: between traditional buildings with a nave-style model and more recent constructions organised into wings, they show a very clear preference for the former, which have the principal characteristic of situating living units near to areas of passage and of making the central intersection “not only a nerve centre, but a kind of place of sociability”. The author stresses the function assigned to the central intersection as “a place of transit (prisoners pass through them often, whether accompanied or not, in order to go to the medical centre for example) and mixing of different people (one can encounter lawyers, prison officers and rehabilitation and probation counsellors etc.), and even as a place of sociability or at least where people across each other’s paths – admittedly in a transitory and superficial way, but in a repeated manner which breaks the routine”. Finally, in order to avoid the situation ascertained in one remand prison, in which the classrooms, located on the third and fourth floor, were deserted by the prison population, it is important for the activity rooms, interview offices and meeting rooms mentioned above to be able to be located on the same floor, if possible on the ground floor These premises need to be easily accessible while protecting, if necessary, the anonymity of the persons who go there and the confidentiality of what takes place. Treatment areas need to ensure a certain discretion for the persons who go to them. .By way of illustration, provision needs to be made for convivial rooms enabling the implementation of health education actions (workshops on the treatment, support, prevention and study of addictions for example) and support groups (concerning traffic offences, marital violence or offences of a sexual nature for example) in premises established within health units, without however being directly visible from areas of passage. Grouping these rooms together enables informal and direct exchanges between professionals: thus, in one long-stay prison, the office of the prison head is located next to a health unit, which for example makes it possible to resolve questions of emergency hospitalisation and removal from prison for treatment as quickly as possible. The location of premises intended for senior and middle-ranking of managerial staff at the heart of the prison buildings enables better knowledge of the persons to be taken care of and makes their supervision easier. Professionals from the welfare sector235, who engage in occasional actions and have interview premises at their disposal located in close proximity to those of the SPIP, are thus enabled to work in cooperation with other professionals rather than on their own. This provides an opportunity for informal exchanges of information which, otherwise, would not necessarily be passed on. Comparison of the opinions of sports instructors, warders, CPIPs, teachers, tutors and doctors can lead to more individualised and personalised handling of prisoners. Nevertheless this accessibility should not for all that condemn persons who go there to visibility, which could be prejudicial to them. Indeed, numerous persons accommodated in CEFs and prisons require somatic treatment or psychological support, in particular with regard to the offence committed. These 234 Grégory Salle, “De la prison dans la ville à la prison-ville” Métamorphoses et contradictions d'une assimilation, Politix, 2012/1 no. 97, p. 75-98. DOI: 10.3917/pox.097.0075. 235 National employment agency, family allowance social security office, primary national health insurance office etc. 153