The formal outline is one of detailed and outline that is structured.

It permits one to plot main points and major supporting details. Generally is written in full complete sentences.

Main ideas are designated with Roman numerals.

Supporting details are designated by capital letters.

Points to develop further are designated by Arabic numbers.

Scratch Outline

Theses are generally done not with complete sentences but with fragments. Writers who prefer only points that are main outline will use the scratch outline.
Writers who prefer to not use detail that is much make use of the scratch outline.
Writers who prefer developing ideas as they draft, will make use of the scratch outline.
This will be for writers who find an even more detailed outline constraining and choose to have this outline.

Outline Tree

Rough Draft

Regala la palestra