The interviewer would like to know more about the types of decisions you are accustomed to making in the workplace. The way you answer this questions will give them a good idea of your level of experience, seniority, and ability to handle the decision making requirements in this potential position.
If the job you are interviewing for requires you to be decisive and quick on your feet, you will need to be able to provide examples of how you have done these things in the past. If you worked in tech support, you were faced with problems that you needed to find solutions for on a regular basis. If you worked as a sales rep, you may have needed to know how to negotiate and make decisions on prices and benefits you can give your customers.
You may have been faced with decisions that became so routine you didn't think twice! Refer to these types of decisions and be sure to highlight how these types of decisions have prepared you for a role like this one.
