The idea is to "learn" from user behavior. Start with a blank slate where the elevators assume that all floors, except the first floor, have the same probability at all times. Then, based on user behavior, alter the probabilities. If the elevators can talk with the users' phones, via bluetooth, and identify to which floor this user goes, when he/she comes to and leaves work, how often does this person take the elevator to go to other floors or out on lunch, then improve the efficiency based on the aspects learnt.

I use spreadsheets for 'what-if' analysis and struggled to make the math work on paper without the help of a calculator. I did note that my first step before doing a design would be to conduct research with builders who would know how reality impacts the theory of building design. I recall a PBS episode where an academic tried to raise a roof over the Roman Coliseum to prove his theory that the games enjoyed shade. The producer of the documentary wisely invited two circus managers who raised tents for a living to attend and give advice. Even before the first attempt they chuckled and said it would never work - something about the length of the rope and the size of the canvas sheeting needed being wrong. The academic assured them that everything had been carefully calculated and would, of course, work. To his frustration (and the circus manager's enjoyment) it flopped utterly just as predicted by those with practical experience. The question was apparently designed to evaluate my performance on detailed calculations while under pressure. I can count on one hand the number of times I've been faced with that situation in my 30 year career.