Think of times when you’ve had to give criticism of some sort and the person didnt take it well. A lot of people dont take negative feedback well. What the firm’s probably looking for here is the ability to show that you can deal with people diplomatically and defuse a situation, that when someone responds badly to feedback you can ensure that they still take what you’ve said on board and you can make sure it doesn’t become a major issue.
Just think of times when you’ve worked with others and provided feedback/critisism, then try and consider their reaction. Was it always 100% positive, or is there a time when maybe there was a bit of resentment of whatever at what you’d said??
The no of questions you’ll be asked varies. And they’re not always as direct as ‘tell me about a time when’. Just make sure you know the competencies they’re assessing you against inside out and can work them into other questions that arn’t directly quizzing you on that competency.