Recycling begins with materials collection and separation, followed by sorting of the recyclables at a materials recover facility (MRF) for reprocessing or reuse. There are two basic methods of separation and collection of materials for recycling. Source separation involves specific containers provided in designated exterior areas of the restaurant or hotel. Each is marked with a description of the material to be placed in it (aluminum, cardboard, glass, or food waste). Similar containers are placed in work stations throughout the property. Staff members separate recyclable materials and place them in the appropriate containers in the work station. These containers are emptied by designated employees and transferred to the central collection point. Although this method has been successfully used by The Hard Rock Cafe in Las Vegas, it is the least preferred method of collection because of the space needed for in-house collection and its labor intensiveness. With frequent turn-over of personnel in the hospitality industry, constant staff training is necessary to make this method feasible.In contract separation, waste materials and recyclables are separated at the end of the waste stream. Hotels (and occasionally restaurants) pay a private recycling company to sort waste and separate recyclable materials from waste to be discarded. Recyclables are placed in specific recycling containers during the sorting process, and are later removed for recycling.