An Authority should have an up-to-date register detailing all variations completed to date on its project. This would typically include the capital cost of the variation, whether maintenance and/or lifecycle replacement was included in the variation and the change to the unitary payment as a result of its implementation. Other useful information would include add on costs such as management fees or markups where appropriate. Also of note would be any changes to the services specification, any alterations or additions to the Authority's Requirements documentation or Room Data Sheets and any impact on the project's payment mechanism.