How do Street and Besnier summarize the history of writing? What were its functions? What type of writing system exists? Why do Street and Besnier reject an evolutionary model of writing systems? What is the 'autonomous' or 'Great Divide' model of literacy? What is the 'ideological model' of literacy? Why do they argue that it is best to consider that there are a variety of literacies rather than a single type of literacy? What are some of the ways writing has been used around the world (past and present)?