Organize your material
Identify relationships between items: ``A depends upon B'', ``B and C are alternative ways of doing the same thing'', ``D is more general than E'', ``X and Y are similar except for ...''
Order ideas based on dependency.
Eliminate duplication: ideas that are common to different approaces should be discussed only once.
Organizing Chapters:
Introduction should reveal high level relationships.
Organize chapters by ideas/intellectual questions. NOT by Approach of XYZ, Approach of PQR...
Ask yourself all the time: ``Is this the best place for topic X, or is it better to put it after topic Y?''
Rough draft: Complete rough drafts of all chapters before generating final version of any chapter.