The Private Finance batches follow the ‘‘Design, Build, Finance and Operate” deliveiy model with an operational period that generally lasts 25 years. The criteria should explicitly avoid introducing preferences resulting from accounting rules for financing assets off-budget or off-balance-sheet. Currently, in Chile, decisions regarding whether to propose the concessions model for a particular infrastructure service are taken by the same unit that is responsible for the delivering the project, the CCOP. The decision to proceed with a concession, PPP or a traditional procurement process should, ideally, be taken by a body that is independent from the delivery units.