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Moving the amount calculation

As I look at amountOf, I can see that it uses information from the rental, but does not use information from the customer. This method is thus on the wrong object, it should be moved to the rental. To move a method you first copy the code over to rental, adjust it to fit in its new home and compile.

Read more: CS605 - Software Engineering II - Lecture Handout 43

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Environment Assessment

The legacy system also needs to be assessed from an environment’s perspective. This involves looking at the supplier, failure rate, age, performance, support requirements, maintenance cost, and interoperability.

These angles are elaborated in the following paragraph:

Supplier stability: Is the supplier still in existence? Is the supplier financially stable and likely to continue in existence? If the supplier is no longer in business, is the system maintained by someone else?

Read more: CS605 - Software Engineering II - Lecture Handout 39