[stefanpie]

This brings flashbacks of standing next to part bins in circuit labs with a multimeter in hand, trying to match components. Unfortunately, the TAs and course instructors did not emphasize your point, and the measured part values and thus the measured filter cutoffs had to be close to perfect to be checked off.

In the past, I have looked at using optimizers to solve for component values of complex analog circuits. I only looked at optimizing accuracy at one corner, but it would be interesting to see what people have done to optimize multiple variables, like including noise, for multiple corners. I think I've seen some Monte Carlo simulation mentioned once to suggest fuzzy solutions within some specification. I would be curious to see if others know more about this.