Example written question: Tell us about a time you took an innovative approach? Example technical interview exercise: Examine a P&ID for some time (15-30 minutes, I forget exactly how long I had). Then talk through it and answer some questions, e.g. when X valve shuts, what happens to the pressure in location Y. Example Assessment Centre group task: Each candidate is presented with a potential infrastructure project to analyse. There is then a group discussion during which candidates are asked to present their project analysis and discuss recommendations.