The three major types of submittals are based on the timeline of the project:  Preconstruction submittals are submitted after the contract is signed, but before construction starts. They include items like certificates of insurance, risk management plans, and schedules. Construction submittals happen during construction and are grouped into two subcategories: action and information. An action submittal requires signatures of the parties involved and is a method of quality control. These are submitted before the actual installation of the material. An informational submittal simply reports on how the installation went and does not require a signature. Closeout submittals are submitted as the project is wrapping up and often include warranties, operation and maintenance information, and notification of any leftover construction material that might be needed to maintain the site in the future.