Parts standardization is a program for planned elimination of superficial, accidental and deliberate differences between similar parts and uses it in several products. The product dimensions of repeatability, product volumes, product costs, and the match between design and the capabilities of the production facility are addressed. Producing a large quantity of the same part means you are repeating the same process for a large volume. The design of the part can be such that it matches the capability of the factory and product costs.
Modular designs also address the testability and serviceability of the product, in addition to those dimensions covered by parts standardization. By testing the modular section prior to assembly into the larger product, one (or several) tests can be completed prior to final assembly, where a failure means taking the final assembly apart. It is also easier to service a smaller section than trying to work with a larger one.
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