At the assesment event they introduced their Company, role of the position. 3 people in a group, 1 Engineering Manager, 2 Chief Engineer. They asked questions in a turn. They asked also technical (1 to 1) and behavior (2 interviewers) questions. Concentrated on what you have done in the past, your ability, your skills, inovation, team work (very important). Team work with other 3 candidates to check our team work skills.