"To write the plan" means to create or draft a detailed document or set of instructions that outlines a specific course of action or strategy. Full definition
You and your spouse must put down in writing your plans for distribution of your assets and how your children will be carried for. (divorce.com)
It's the news about that author, the press releases about that author, the author's reviews and speaking engagements and the future writing plans of that author. (unrulyguides.com)
Assist Lead Teacher in reviewing the progress of each child and developing written plans to promote each child's growth and development. (caterpillarcornerlc.com)