The pleasure of reading is intrinsically connected to a well-written text. Thorough proofreading, done with care and by a qualified professional, is always necessary whether in texts that do not require much work, being orthographic and grammatical review enough to polish them, or in those productions with a more complex structure, entailing process-directed analysis.
You may choose from three text deliver formats:
1) ALL alterations to be approved or refused;
2) SOME alterations (doubt-raising parts) to be approved or refused;
3) SOME alterations (doubt-raising parts) to be approved or refused and HIGHLIGHT on the remaining alterations.