Updated: Oct 28, 2019
Ex 19.3
Q: Why is it impossible to infer the emergent properties of a complex system from the properties of the system components?
A: Emergent properties are characteristics of the whole system- These properties include performance, reliability, usability, safety, and security. Components can have these characteristics as well when utilized on their own, but not when it is part of a whole system. Also, when humans are in the mix, a new degree of unpredictability is added.
Updated: Oct 17, 2019
Ex 18.4
Q: Define an interface specification for the Currency Converter and Check credit rating services shown in figure 18.7
A:
Currency Converter:
convertCurrency
Input: amount (double), givenCurrency (string), wantedCurrency (string)
Output: converted (double)
Exceptions: Invalid Currency
exchangeRate
Input: givenCurrency (string), wantedCurrency (string)
Output: exchange(double)
Exceptions: Invalid Currency
Credit Rating Service:
creditRating
Input: idNumber (int), emailToSendResult (string)
Output: score(int),
Exceptions: Invalid idNumber
Collaborated with Meagan Gould
Updated: Oct 5, 2019
Ex 17.10
Q: Your company wishes to move from using desktop applications to accessing same functionality remotely as a service. Identify 3 risks that may arise and how to reduce them.
A:
Risk 1:
Database Extensions- if the databases are stored in the desktop applications, one might have migrations problems to a cloud based database
Reduction Recommendation: Do ample research in the database currently being used and create a plan for the best way to move this specific type of database to the cloud- research potential road bumps
Risk 2:
UX/ UI- when migrating the system the design may look a bit different with may confuse the typical user or create a learning curve for manipulating the new software systems
Reduction Recommendation: warn staff and create a help section for navigation paths that may be different
Risk 3:
Lack of Allocating Sufficient Migration Time- there might be many more problems that are discovered through the migration process that management may be unimpressed with
Reduction Recommendation: Set migration expectations longer then potentially needed if unsure about this exact process