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 A=> The frame 

The frame is the bones of the sofa so to speak and as in the human body, a solid structure is critically important. A good quality sofa in either the mid- to high-end range is typically made with kiln-dried hardwood that is free from knots. Kiln drying is the process by which the moisture is removed from the wood, preventing it from warping and twisting at a later date. The presence of knots in a piece of wood indicates a point of weakness. Lower-end sofas may be constructed of plastic components, laminated boards, metal, or a combination but most of these are less than ideal.