Precision is critical to good writing.
Whether your document is professional, academic or commercial in nature, you want your words to communicate your thoughts and ideas accurately and appropriately to the audience for which it is intended.
Likewise, precision is essential to good editing and proofreading.
You want a copy editor who will catch and correct every error in grammar, spelling and syntax. Moreover, you want one that will edit for word choice, structure and tone to ensure that your writing communicates as clearly and effectively as possible.
This is the standard quality of work delivered by MM English.