In grade nine visual arts, the students taught me just what it means to be clear. If you want them to draw a plan for a project you must structure that as a step by step exercise. Most of the time the students didn’t plan but they did produce work.
I would stop that process at different points and get them to sketch out their ideas, for the next steps. I would provide various resources for ideas. This is an important skill to work on. When a project gets planned and not merely executed the outcome is so much more complex.
Teaching students to plan a project in any discipline is teaching a learning skill that is so important. I showed students my “good examples” where maker used blog to document their planning, execution, and products in application.