What are the criteria used for grading a trek? One article that I came across provided the following set criteria for grading:
- Duration.
- Terrain (includes altitude).
- Exit routes.
- Weather/Climate.
Is there is an official way of grading, or an agreed set of attributes within the trekking community regarding the same?
EDIT: I have removed the reference to Annapurna trek aiming to keep the discussion generic to trekking and not specific to treks from the himalayan range.
Second Edit: Removed the part where I referred to a trek being classified as easy/difficult. Now the question is more focused on the criteria of grading a trek and nothing more.