How Long Does It Take?

Every program on this shelf so far either works or does not. This asks the other question: how much work is it, and what happens when there is more to do? Guess a number between 1 and 100 and you need seven guesses, not fifty — and a thousand needs ten. Find a name in a sorted list against a shuffled pile. Count the steps, double the data, count again. No screen, no code: paper, a pencil and a tally.