The DRC labor code (Article 40) provides that in case a daily worker has completed twenty two (22) working days over a period of two (2) months, the new contractual commitment entered into will be deemed concluded as a permanent contract. One should comply with the legal duration required by the law. Some organizations, mainly NGOs apply a shift system after completion of 15 working days in order to comply with the law. As far as UN agencies are concerned, contracted labor unions are used.