So the people designing the spec don't have enough information about the problem space. As the programmers begin working, they explore the problem space, extrac

So the people designing the spec don't have enough information about the problem space. As the programmers begin working, they explore the problem space, extract the information they need to understand a solution, and then they can actually solve it. Bit of a Schrodinger's cat situation... The solution must remain undefined until observed.