Most people assume that a job interview serves the sole purpose of being an opportunity for the employer to evaluate a potential employee. They see it as a one-way street, but it's really not. The interview is not only a chance for an organization to get to know a candidate better; it's an opportunity for a prospective employee to become more familiar with a company.
You may think that simply means you should be listening closely and looking around to see what the office environment looks and feels like. But you can and should take a much more active role in the process. Even as a prospective employee, you are allowed to ask difficult questions that will give you a better idea of the place you may end up working in. It's not just a test of you; you are permitted to test them. What kinds of questions should you be asking?