Some Procuring Authorities adopt a more formal approach, with official letters used as the primary form of communication. This is a requirement of the Brazilian administrative system, and therefore is the approach taken by Procuring Authorities there. This approach is also common in India.
The PPP contract will usually identify formal points of contact and formal means of reporting and communication. However, several other less formal contact points and means of communication will generally also be beneficial. Channels of communication must be properly managed to ensure that they are efficient.