A text with impeccable punctuation can still be incredibly difficult to understand. Correct sentences that appear in each paragraph do not guarantee that the reader will know why one paragraph follows another or understand what you are attempting to convey. This is why structural editing should happen before grammatical editing. Grammar polishes the level of a sentence, but structure determines whether the text has an obvious purpose, a logical order, and a clear direction.
Read the text all the way through without making edits first. Then, write a single sentence explaining what it is meant to accomplish. It may be intended to demonstrate a process, make comparisons, advance an argument, or encourage an action on the part of the reader. If you cannot articulate a single purpose easily, then the draft is probably going to require something more than just correcting spelling or commas. A missing goal often results in redundant statements, digressions, and paragraphs that conflict with one another.
Examine each paragraph individually next. Attempt to define what role a few words describe, e.g., problem statement, case study, causes, recommendations. Two consecutive paragraphs may be performing the same task; the next major step in the argument may be omitted. Defining the function of each paragraph exposes the order of thought. It also shows you what paragraphs to reorder, merge, trim, or delete before you refine the sentences.
For example, consider a short article that starts with general background information, then suddenly moves to the recommendations, and goes back to background information, and finally, near the end, starts describing the problem. Fixing spelling errors and commas will not change the order. Before recommending something, the reader has to first understand the problem and the background. An edit of the text at this structural level may entail moving the problem to an earlier position in the text and clustering the background information, and then following that with the recommendation. The lines will be easier to work with only when the order and structure are corrected.
Starting with grammar may also lead to a lot of wasted work. You may spend time rewriting a paragraph, refining the construction of a long sentence, and fixing capitalization and commas, then decide to cut the entire paragraph later because it is redundant with another statement. Isolated editing passes prevent this mistake. Perform the first pass to fix the purpose and paragraph order, then the second to fix clarity and sentence rhythm, the third to fix tone and consistency, and the last pass to do the proofreading: grammar, punctuation, capitalization, and spelling. Each pass is designed to answer one question or another, which makes the work more manageable.
Finally, do this quick sanity check by reading only the opening sentence in each paragraph. The resulting sequence of topic sentences should explain the text’s basic progression. Are they repeating the same assertion, moving to unrelated topics, or seem to occur in an illogical sequence? If yes, then the order still needs some work. Change the paragraph order and transitions until you have a clear, linear path for the reader to follow. You do not want elegant wording yet; just a clear line of thinking.
Yes, grammar is important, yet it is much more effective once the bigger issues with the text are taken care of. If you know what the goal of the text is, who the audience is, and the order of paragraphs makes sense, then you are ready for a more productive editing session, and your corrections will also be easier to do. One sign that your text is ready for the final pass is not that every sentence sounds good, but that each paragraph makes sense and the draft remains readable even without a correct final punctuation.