identification and establishment of baseline baseline

Analyze the change and judge the necessity of the change according to the cost / benefit and the technology involved

Determine whether to make changes; Record and track changes; Take measures to ensure that changes are controlled. Three types of Libraries: 1) development library: for developers, with frequent modifications and loose control; 2) Controlled Library: save the phased products released at the end of a certain stage in the life cycle; 3) Product library: used to store final products.