Interviewing is no longer a come-as-you-are event. It requires research, preparation and practice!
You can learn a lot from improvisational actors. They’ve pre-planned their entire act! They know the content they’ll use, no matter the situation. They are masters of “thinking on their feet!” You can do this too!
Start with STAR stories.
The STAR acronym helps you structure your answers. S stands for the situation. This is where you provide a very high level overview of the scenario. T stands for the task you were assigned or took the initiative to solve. In other words, describe in one sentence what made the situation a challenge. A stands for the actions you took. Use bullet points to state what you did, step by step. And finally, R stands for results. This would be the quantifiable outcomes of the steps you took to resolve the situation and challenge. You can download a worksheet here.
You can read the twinkling details over at On Careers