According to the standard RiAI documents, the contractor is required to build the works in accordance with the plans, drawings, invoices and specifications that define the work in written and graphic form. Construction documents are linked to or referred to in the construction contract. The composition of construction documents depends on the nature of the work. The attestation of the contract administrator (usually the architect) that the work is completed has a number of consequences. The page is returned to the employer. A building health and safety plan must be provided. Depending on the contract, liability insurance can also lag behind. As a general rule, the contractor is entitled to half of the accumulated reserve amounts. The improvement time or the failure correction time begins.