Visited on a recruiting trip to their Houston Office, then was contacted by a recruiter to set up an on campus interview. They had you complete a short writing assessment before the actual interview, and that was not very difficult. The night before the interview they hosted a dinner and had employees from various departments there to field any questions or concerns you may have. The on campus interview was very conversational and laid back, basic "walk me through your resume" style and a few behaviors. Then an in-office "super-day" which consisted of two interviews with management and a case study. Again, nothing to difficult or out of the ordinary in any of the interviews. The case study was easy and nothing to stress over.