Using the minisim as an example. The product that was being made required a specific amount of friction in order for the product to work. Specifications should most certainly be followed to a t when a final product is being worked on. Deviations of specifications can cause many issues in a product or even failure; which is not a desired outcome whatsoever. However, it would be possible to play with the specs during testing. For instance, in the minisim if the company was to experiment with different friction coefficients different than the original specs this may be okay. However, one final friction spec would need to be chosen, and used throughout validation, and so on. Not following the spec’s in the final SOP, or using different materials than listed on the BOM is likely to cause major issues.