This sector comprises establishments primarily engaged in manufacturing furniture and related products. The processes used in the manufacture of furniture are standard methods of forming materials and assembling components, including cutting, moulding, and laminating. The design of the article, for both aesthetic and functional purposes, is an important aspect of the production process. Design services may be performed by the furniture establishment's own staff or contracted to industrial designers. Furniture is classified based on the application for which it is designed. For example, an upholstered sofa is treated as household furniture, although it may also be used in hotels or offices. Furniture may be produced on a stock or custom basis and may be shipped assembled or unassembled (knockdown). Establishments primarily engaged in manufacturing furniture frames and parts are included in this sector.