In a traditional procurement, the government provides detailed specifications and tenders its project to a contractor. The government prepares detailed specifications that describe the needed service. The specifications are then published in order to get the most competitively priced tender.
Once the contract is awarded, the government closely supervises the works carried out by the contractor in order to ensure compliance. In this way, the government takes responsibility for the design and planning of the project, all legal issues, and any unforeseen costs or emergencies. The government is responsible for the contractor going over budget or committing construction errors and has very little control over the timeframe of completion.
When the asset or service becomes operational, the government is responsible for performance. The private sector partner is responsible only for the delivery of the service according to the contract.
In a PPP, the government outlines the service that is required. Should the PPP option be the preferred method of procurement, the government leaves it to the private sector partner to develop a proposal to meet the needed service. The private sector partner will be selected through a bidding process. This approach ensures that projects are driven substantially by the private partner and thereby results in greater value for money.