Spelling errors can appear in all steps that require writing. The writer should correct spelling errors during the proofreading and editing. Both stages include spell-check. The text editing require reading and text check in details, including logic errors or misinformation, style and composition of the text as a whole. The proofreading focuses on spell, gramar and punctuation errors among others, it is the last stage before publishing, so it is more like checking for the last time if everything is correct and ready.
