They follow a four-step process that is quite lenghty and thorough.
1. Online application (Previous employment, contact method, etc)
2. IQ Test
3. Phone Interview (Mainly concerned in how the person will or has handled a situation) What helped me the most was preparing with the questions they had send me for possible interview questions. They were not word for word but if you have an idea beforehand the answer can be easily tailored. Preparation is key during the phone interview, you need to feel confident of what you are talking about.
4. In-person Interview (n the process, will have conference in Cincinnati 11/29-11/30, all expenses are paid for)