Final identification of material selected. Compare the three to five final candidates on the most important points. If they all seem equally good choices, consider more subtle aspects such as aesthetics and economics. Rank them according to their relative value in this application, and explore the pro's and con's of using each one. Reiterations or review of selection.
Every materials selection involves compromises.
At any point in the coarse or fine screening process you may see that some specification has unnecessarily limited the choice of materials, material types, or families. Perhaps aesthetics could be satisfied by a different method of finishing. You should be flexible, and willing to change your part design. The selection of materials is a dynamic process. N.Y. McGraw Hill.