Furniture designers are involved in the construction process at various stages: pre-construction, construction, and post-construction. In pre-construction, designers work with clients to understand needs through sketches and drawings. They develop design concepts and present drawings to clients. During construction, designers oversee manufacturing and installation. Post-construction, they provide customer service and further optimize designs. Drawings play an important role at each stage, from initial process sketches to technical drawings used for manufacturing. Schematic drawings are also used early on to illustrate design concepts to clients.