Chapter 7 & Chapter 8

From Chapter 7 and 8, we could tell from the author's point that the existing of diversity is very important to the part of big city planning. At the end of chapter 7, Jacobs generate four indispensable conditions that exuberant diversity in a city’s streets and districts. And according to her, “the necessity for these four conditions is the most important point this book has to make.”(p151) Chapter 8, as it titled, basically it gives many detail information and explanations about how important the need for the mixed primary uses. The author talks about this idea from many aspects, such as: time, space, people and etc. As it just begins, she said: “On successful city streets, people must appear at different times.” And in this long chapter, the author also gives different examples about how the mixed uses function in different situation. One other main point the author wants to tell us is primary use mixtures must be effective if they are to generate diversity. Then she talks about how to combine all the condition together in order to make them effective to the diversity.