You enter the movie theatre and scan the room.
Three questions arise:
1. What is the best distance to be from the screen?
2. What seats are taken?
3. How likely is 'big hair' going to mess up my view?
You make a decision where to sit.
Behold, you are a Masterplanner.
Masterplanning in the built world is just like that. Only, the issues are all about sunlight, fresh air, views and shelter.
Now, like a masterchef, add to your analysis an artisitc concept that will give identity, beauty and coherence to the whole (and make it easy to find your way around) and the cake should come out just right.