Through this question, the interviewer is essentially trying to check your clarity of thought. He/she wants you to describe the important first steps you need to take to ensure the success of a project. A good manager would try to understand ‘what’ of the project before ‘how’. What it means is you first try to understand what is the objective or purpose of the project before diving into how to achieve the goals of the project. Hence, anything on the above lines would get you some brownie points.