It's not uncommon to do group interviews. Often, they will put you in a room with other people also applying for the job, and then have you do group tasks as a way of evaluating your interpersonal skills. Not everyone gets the same tasks but an example of something I had to do would be survival planning. The room was divided into 2 groups (my interview group was 8 people) and they gave a scenario where you're flying over Alaska when your plane crashes. You're not near any towns and so, if help is coming, it's going to take a long time and it's getting late. Here's a list of items that you or your fellow passengers have/found. Choose the 10 most important items and then sort them based on their importance. You had to be able to explain WHY it was important. Then you had to detail your plan on using those items. The purpose of this exercise was to get a feel for who was actively or passively participating. Who was problem-solving or keeping things organized? Was there confidence in peoples decision making and were they willing to/able to make a good argument for their point?

Went through a phone interview, had an in person interview 3 days later. Received a call the next day asking for permission to do a background check. 2 days later I was called back and offered the position.