There are various levels of editing that require different sets of expertise. Developmental editing, sometimes referred to as structural or general editing, is a substantive process. It includes checking the content, determining its flow, commenting on the style of its presentation, and offering change for improvement. This is the first editorial stage. Copy editing, also known as line editing or text editing, does not address the structure of the book. The main purpose of copy editing is to adjust the text to correct its grammar and improve flow, without, in any way, changing the intent or meaning of what has been written.