Some universities require further instruction in writing and offer courses that expand upon the skills developed in First-year composition. Second level or advanced composition may emphasize forms of argumentation and persuasion, digital media, research and source documentation formats, and/or genres of writing across a range of disciplines and genres (see § Writing across the curriculum below). For example, the skills required to write business letters or annual reports will differ significantly from those required to write historical or scientific research or personal memoirs.