I also find this a bit of a grey area. Say I had a goal to lose 10lb of weight within a 3 month period. Under the GTD definition would this be better described as a project? Previously I would have said this would be a perfect short term goal, but having read Making it all work I am now re-assessing this. It seems to me that every productivity guru likes to re-badge these concepts which can cause some confusion.
I find GTD unique in the management of tasks and projects, but I also previously found great value in yearly goals, quarterly and sometimes monthly goals. Is it best to ditch these for the GTD version for consistency purposes to avoid confusion? How do other people handle this?