[DrJokepu]

Mostly they just don't know how to start. They can't break down the problem into subproblems. Once a candidate managed to break down the problem to subproblems, they can always do the rest easily (solving the subproblems, composing the solutions to solve the main problem).

[cantastoria]

Ok in that case then they're a no hire as that's just a fundamental part of developing software. Although I must admit that this problem surprises me more than people's inability to code. I mean if you can't break down problems you're just ill suited to the field.