Finding the right cultural 'fit' is vital to a successful career move. If you join a company with a corporate culture that you find uncomfortable, you could find yourself demotivated and dissatisfied. And once you fall into this state it may be difficult to get yourself out of it. Hence it is important to take the time to find out as much as possible about what the organisation is like - before committing yourself to a move.
The trouble is that organisational culture is hard to assess – especially from only a brief meeting. That is why it can be helpful to adopt a fairly structured approach in the interview. Don't make the common mistake of many candidates and rely solely on your intuition, as you might easily miss important clues.
The best results come from researching the company beforehand, consciously observing the environment and people's behavior. Then in the interview you can ask specific questions about aspects of the culture that are important to you. Planning them in advance reduces the risk of forgetting to mention something significant.