What is a plan?

To make a plan is to determine and fix ideas.
It is to have had ideas.
It is to so order these ideas that they become intelligible, capable of execution and communicable.
A plan is to some extent like an analytical contents table. In a form so condensed that it seems as clear as a crystal and like a geometrical figure, it contains an enormous quantity of ideas and the impulse of an intention.
Le Corbusier, 1923