The Agency must put contracts for services, goods or for the purchase or rental of a building out to tender before concluding them. These invitations to tender satisfy the principles of sound financial management, equal access to suppliers and ensure transparency. Officers preparing contracts must define their characteristics, calculate their total expenditure and specify their duration. This process enables identification of the applicable tendering procedure; open, restricted or negotiated.

Tender documents include at least the terms of reference, a letter of invitation to tender, and a draft contract. Rules also govern the sending, receipt, opening and assessing of these documents, as well as the awarding of the public procurement contract.