A little while ago I wrote about documenting even the small jobs. A similar rubric is not to over-document.
I recently asked a team to prepare a project plan for a major piece of analysis on the performance of a $350m program that I direct. They diligently used our project planning template, but, alas, it was too much for the scope of the project and attracted unhelpful questions. Good questions, but ones that mislocated the intent of the project.
This was nothing dramatic, but it reminded me that the project plan has to be right-sized for the project scope and probably, if you want to apply a metric, for the dollars likely to be at risk in the project.