A manufacturing process for providing an assembly formed of a first piece and a best fitted second piece is described. The manufacturing process is carried out by performing at least the following operations: receiving the first piece characterized in accordance with at least a first attribute, selecting the best fitted second piece from a buffer, the selecting based in part upon a best matching value of a second attribute in relation to the first attribute, replacing the selected best fitted second piece with another second piece such that the number of second pieces in the buffer remains about the same, and forming the assembly the first part and the second part to form the assembly.