Question

How might you use a model of a system that already exists?

Explain why it is not always necessary for such a system model to be complete and correct. Would the same be true if you were developing a model of a new system?

Answer 1

Given that,

The model of a system that already exists can be used during requirements engineering.It hepls in clarifying what the exist system does.It can be used as a basis to identify the strength and weakness of the existing system and hence can identify the enhancement required to be made.

It is not always needed for an existing system model to be complete and correct because it is not the model on which the entire requirements developing is based on.it gives the view of the existing system and the helps in identifying the new requirements.The model becomes a basis for the development.As the system development will not be completely based on the existing system model,it is not always needed to be complete and correct.

But it would not be the same in the case of developing a model for new system.it is needed for these system to be complete and correct.models of the new system are used in requirments.These models are used for the design and implements of the system.As they models are used in the system development,these are required to be complete and correct.