This is quite a normal practice. With requests for proposal or tenders, we have an estimated value of work to be done that could cover 10, 15, or 20 years. We don't have all the specifics up front, so we ask the companies to provide us with level and effort prices for the first few years, and then it will be pro-rated. And each time there's work to be done in addition to the maintenance, the company will provide us with estimates at that time.
On April 10th, 2008. See this statement in context.