When I'm interviewing someone the litmus test I use is asking them about the documentation. Anyone who has only superficially used whatever language/library/to

When I'm interviewing someone the litmus test I use is asking them about the documentation. Anyone who has only superficially used whatever language/library/toolkit it is will generally say the documentation is good (what else can they say?) Those that are battle hardened will have looked at far more of the documentation, and found it lacking. Consequently if they can explain that it sucks and why it sucks I know that they have learned the topic at hand. It also catches out the folks who read "programming X in 8 hours" and put X on their resume. They won't be able to say anything intelligent about the documentation.