Order the steps of top-down decomposition as the lesson describes it.

1. State the whole task in one sentence
2. Break the task into a few major sub-tasks
3. Give each sub-task a clear name and a defined job
4. Refine any sub-task that is still too complicated into smaller ones
5. Stop when every remaining piece is simple enough to write directly

Decomposition starts from the whole and repeatedly splits, naming each piece as it goes, until nothing left is complicated. Starting from small pieces and gluing them together is bottom-up, which is a different discipline; the top-down order is what keeps each level a complete description of the level above.