11.1 The changing system
变化的系统
Software system are evolutionary.
A customer makes a decision to do something a
different way.
The nature of the system itself changes.
Types of Systems, in terms of the way it is related
to the environment in which it operates
S-systems
P-systems
E-systems
软件系统是演化的
顾客以不同的方式做某件事
系统自身的属性发生了改变
系统类型，用系统和系统运行的环境来描述
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