An employment contract is a consensual agreement which can be concluded orally and for which no written proof is required. However, in some cases the law requires that prior to recruitment a document is made up. Sometimes this requirement refers to the whole of the agreement. Written documents are necessary for: employment contracts for a fixed period or for a specified task, part-time employment contracts, replacement contracts, employment contracts for home workers, employment contracts for students, employment contracts for temporary work and temporary agency work, and employment contracts for tele-work. The law also requires certain stipulations of the contract to be laid down in writing: the competition clause and the Delcredere clause for sales representatives. These clauses do not necessarily need to be written down at the time of recruitment.