The importance of pre-production

The reason why such great works of art (e.g. sculptures, movies, paintings, etc.) are great is because of the pre-production process. The creator has had to go through the very tedious part of coming up with an idea, setting a plot or a visual to the story and actually apply the idea onto canvas, or film, or the material used for their creation.

What are you doing?
Why you need to plan about your plan. See what you want in order to let other understand your vision and see to it that the process is executed flawlessly. For example, the creators of the Assassin's Creed series must have everything planned ahead of time before heading into the production phase. In order to ensure a great game.

How do you think this should go?
Now that they've gotten an idea about your vision, make sure that they understand how you want to go about it.