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For a simple pendulum I have my beginning students vary the mass,
length, and amplitude, one at a time; make graphs of the dependence
of the period on these; and, along with dimensional analysis, try to
deduce the formula for the period. I can’t see this experiment
being as instructive if they changed all the variables at once
I suppose I could add a comment at the end that there are many
applications where changing just one variable at a time is not the
best approach, so that OVaaT is not the ending point.