CS2113/T - Combined Exercises

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Combined Exercises

Here are some exercises that combine multiple topics.

Choose the correct statement

a. A non-functional requirement is a requirement that hasn’t been fully implemented yet.
b. Functional requirements are always more important than non-functional ones.
c. In a green field project, one must start by studying the existing product.
d. Prototyping can be used to discover as well as record requirements.
e. Users know how the product should be. They just don’t know how to communicate it to us.

Explanation:

Functional requirements are not always more important.
Greenfield projects do not have existing products.
Users can inform us about the present. They may not be able to envision the future. (It’s not the consumers’ job to know what they want --Steve Jobs).

Choose the incorrect statement.

a. An object diagrams models the structure of an OO system at a given time.
b. A class diagrams models the general structure of an OO solution.
c. A class diagram can correspond to many object diagrams.
d. A sequence diagram represents how objects are connected to each other.
e. Sequence diagrams can be used to find APIs for classes.

Explanation: A sequence diagram is a behavior diagram, not a structure diagram. An SD can represent how objects interact with each other (i.e., behavior), not how they are connected to each other (i.e. structure).

Which one of these is the most useful to model a workflow?

Pick the odd one out.

Explanation: RCS is for managing code changes. The others are tools and techniques for managing project schedules. It’s OK if you don’t agree with the answer. What matters is that you know what each one is for.

Choose the least correct statement

a. Principles are typically more general than patterns.
b. Both patterns and principles are ways for us to benefit from experiences of others.
c. Patterns gives us a higher-level vocabulary to talk about design.
d. Most design patterns and design principles try to reduce coupling and increase cohesion.
e. The more patterns we apply, the better the design becomes.

Explanation: Patterns have costs and sometimes they may be an overkill. Therefore, we should apply them judiciously.