Thoughts while reading a book

In my first approach, the system definition is as follows:

- The system has elements which can be separated from each other.

- The system has a structure i.e. there are a lot of links between components of the system.

- The structure of the system - that is, the network of links between its components – is quite complex.

- The system is open in a physical sense i.e. the system has a special behavior with his environment.

- Behavior of a system is consistent i.e. a given input of environment triggers the same or at least similar output off the system.