Editing works at different scales
Developmental editing looks at structure, pace and what readers need from the work. Copy-editing pays closer attention to clarity, consistency and the details of the language. Agree which kind of edit is needed before work begins.
Design makes reading easier
Typesetting decisions shape how a reader moves through a book. Chapter openings, image placement, captions and the length of a line all contribute to the experience.
Proofreading checks the prepared pages
Read the typeset proof for remaining errors and problems introduced during layout. Changes that alter the length of a paragraph can also affect the pages that follow it.