The layout and presentation of a non-fiction text is important because it can easily add to (or detract from...) the meaning created by the text as well as its effect of the reader. Certain genres of texts have fixed layouts - a newspaper article for example. Leaflets, advertisements, booklets and so on are more flexible and allow the writer to think very deeply about the effect they want to create on the reader. When considering layout always keep in mind audience and purpose.