Developmental Editing is an editing process focused on the overall structure, development and organization of a piece of writing. It is generally more comprehensive than copy editing, and provides more in-depth analysis and feedback.
A developmental editor will read through the writing and make sure the overall arc of the story or argument is clear, concise and logically structured. They may suggest changes in structure and organization, or reordering of content, to ensure the argument is easy to follow and flows naturally for the reader. They may also give feedback about characters and plot development, scene and chapter structure, pacing and timing.
The developmental editor will also read for consistency in style and tone, as well as for grammar and language use. They may also check for clarity in transitions and ensure the chosen style and format is consistent throughout the document.
The goal of developmental editing is to get the writing to a publishable level. This may include suggestions for additional research and topics you may need to cover to make the argument complete, or to make the storyline more developed and engaging.
Ultimately, the role of a developmental editor is to work with the author to help bring out the best in the writing and create a piece of work that is enjoyable, informative and effective.