Two phone screens, two in-person interviews including plant tours and tests. The recruiter called for the phone screening and the first phone screen took at least an hour. I was very tired after that. The second phone screen was to determine if I was a right fit for the position as well as Alcon. The in-person interviews required a full suit in order to impress. Make sure to wear close-toed shoes. You'll be in an area which requires PPE (personal protective equipment).