If you work together in groups or with other individuals in a community effort with the common goal of improving everybody's writing processes, then everybody's writing processes will improve. You know at least one answer to that question. Every writer has some ideas about how to improve a specific piece of writing. Once some of those ideas have been revealed, the next step is to make the changes. Then look at the new version and ask what improved and what didn't improve.
Variation is a natural part of any process.
Jot down ways that some processes you are familiar with exhibit variation. Share that list with a small group of students in your class and the write a short explanation of how variation enters into one or two processes you are familiar with. For example, you might begin by looking up the evolution process, process theology, the human development process, the political process, the education process, manufacturing processes, or other similar topics.