The interviewer wants to hear more about your decision making and critical thinking skills. Many times, a client will call you with a new job order, without giving you all the details you feel you need. Maybe you take the job order but then realize that you forgot to ask if the client would consider relocating a candidate, or you didn't gain clarification on the tech skills they would prefer to see.
Keep your answer career based and discuss a decision you made where you may not have had all of the pertinent information. The interviewer would like to see that you can use logic to make a sound decision. Show the interviewer that you are capable and confident when it comes to independent thinking and decision making. Be sure to include the success you saw in your sound decision making.