Page "Analog computer" Paragraph 4

Setting up an analog computer required scale factors to be chosen, along with initial conditions — that is, starting values.

Another essential was creating the required network of interconnections between computing elements.

Sometimes it was necessary to re-think the structure of the problem so that the computer would function satisfactorily.

No variables could be allowed to exceed the computer's limits, and differentiation was to be avoided, typically by rearranging the " network " of interconnects, using integrators in a different sense.