Good analogy. But I would add "this book and the next one that I create" and "you can have help from whoever happens to be with you" In the best case there is

Good analogy. But I would add "this book and the next one that I create" and "you can have help from whoever happens to be with you" In the best case there is still a little "unknown unknown" about both the scope and team. The project manager can tighten things but you can never completely get rid of it.