The first step in an unfastening procedure is to figure out why it is useful to take the product apart.
Answers have to be found to questions like what parts are valuable.
If a bill of material is available, it can provide helpful information for this process. The next step is to figure out what kind of connections are in the product and the type of fasteners used in the assembly process and in what order the disassembly should take place. There is usually more than one way to disassemble a product and methods like the reversed fishbone diagram are available to assist in finding the optimum way. However, some guidelines of how to deal with different kind of fasteners are given here. Joint Comparison Components are joined together in order to achieve a function, to achieve structural efficiency, which includes optimizing material selection and utilization, or to minimize the cost of the manufacture and assembly.