Every new project has different stages when in production. It starts with a brief, which then turns into an extended outline. The outline then becomes a mock-up and that mock-up turns into the first draft design of the project.
After trial and error, we reach the perfect design or the perfect point where the project can be considered complete.
Then all the pieces of the project are combined to form a whole, comprehensive bigger one. Like this sketch below. Take a look at the concept.
Can you relate?