The author describes how different materials are put together to make a piece of furniture. Of the four possible wood grain orientations in a join, the parallel side grain to side grain is the strongest and is least likely to suffer deterioration caused by wood movement. End grain to end grain, side grain to end grain, and perpendicular side grain to side grain orientations are also described. The major types of joints used in furniture making are reviewed. The introduction of the dovetail joint allowed the cabinetmaking profession to develop by making case construction possible. Most joins are held together with either adhesives or fasteners such as nails, screws, hinges, and pegs. These are described. Veneering is a special type of joinery that results in a very strong join if the adhesive is applied properly. However veneers are very susceptible to severe environmental conditions. A description of the marquetry and boulle veneer construction techniques is given. This is the sixth in a series of articles on furniture conservation.