When we write in ‘real life’, what kind of process do we follow? We usually need to think first, write a rough draft, review, amend ... and then produce a finished piece.
What makes an effective piece of writing? Good writers plan and revise, rearrange and delete text, re-reading and producing multiple drafts before they produce their finished document. This is what a process writing approach is about.
There are several ways to approach writing in the classroom. It should be said at the beginning that there is not necessarily any 'right' or 'best' way to teach writing skills.
Since writing is primarily about organising information and communicating meaning, generating ideas is clearly going to be a crucial part of the writing process.