These questions ask about how you handled experiences in the past, since this is an indication of how you would handle similar situations in the future. It is important to note what you learned in the experience since this will significantly impact your future behaviour. If you have not ever been in the situation asked about, answer the question as a hypothetical.
You can use the STARS formula to help formulate your answers to these questions:
S - Situation - Describe the situation in as much detail as possible. Include such details as the people involved, the task at hand, the challenges you faced, and your role.
T - Transferable Skills - Identify the skills you used to handle the situation, pay particular attention to skills that are required by the employer.
A - Action - Explain how you handled the situation and the sequence of actions you took. Talk about how you used your skills.
R - Results - Explain how the situation turned out. What were the results of your actions?
S - Self-assessment - Explain what you learned from the situation. How well did you handle the situation? Are there actions you would repeat? What would you do differently? Demonstrate that you are self-aware and willing to improve.
Example: Tell me about a presentation you gave that did not go well.