What is a function? Describe how functions work in Pyton. In particular, discuss: • As regards the use of functions in programming, distinguish between parameters and arguments. • What is the difference between global and local scope as regards variables in a program? • List and explain three advantages of the use of functions. • Describe the 'Top Down' design approach and how it is used in problem-solving.

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System Model Approaches

The systems model approach is a process-oriented representation that emphasizes the impact or flow of information between modules. The multidisciplinary study of the use of models to design and create systems in business and IT development is known as systems model approach. It models how processes interact and what these processes do, but it does not go into detail about how these processes are implemented. Functional decomposition may be utilized to enhance the models employed in this technique, and they can be coupled to requirements models for additional system partitioning.