Leading questions, which simply put words into the other person’s mouth – effectively asking them to tell you what you want to hear.
Multiple questions, which generally confuse the person who is required to answer them, so they answer the question that’s easiest for them or shows them in the best light – not very helpful if you need to know the answer for the other question(s).
Closed questions, which generally get a “Yes” or a “No” reply and so are best suited to specific information-gathering situations or to confirm information – for example, “Did you book the meeting room for 1pm?”
Open questions, which require more than a one-word reply and generally result in a broad reply that both gathers information and gives you an insight into the topic from the employee’s perspective