The Black-Scholes-Merton model's core was a differential equation that would have been opaque to anyone without college-level training in mathematics. Even in the simplest case, a call option on a stock that pays no dividend (appendix D, equation 2), an unaided human being cannot realistically be expected to calculate a Black-Scholes price. At the very least, a table of natural logarithms and of the distribution function of a normal distribution are needed.

Donald MacKenzie, An Engine, Not a Camera, loc. 712