After filling out an application, it was a single interview that took almost 2 hours. Code and skill questions ranged from use of the code book to memorization of lighting and power knowledge. Things that I didn't know and were taught, were then re-asked at the end of the interview. It was far more difficult than it sounds. Apparently you are only supposed to get 50% right. the more you get right the harder the questions get. The ending difficulty of the questions will determine your wage offer. Time in trade does not matter.