Quality Attributes

Question 1

What are the three categories that system requirements can be placed into?

Answer 1

Functional requirements.
Quality attribute requirements.
Constraints.

Question 2

What is a functionality?

Answer 2

Functionality is the ability of the system to do
the work for which it was intended.

Question 3

What are the three problems associated with defining quality attributes?

Answer 3

1. The definitions provided for an attribute are not
   testable. It is meaningless to say that a system will
   be “modifiable”.
2. Endless time is wasted on arguing over which
   quality a concern belongs to. Is a system failure due
   to a denial of service attack an aspect of availability,
   performance, security, or usability?
3. Each attribute community has developed its own
   vocabulary.

Question 4

Whats the solution to the first two problems of defining quality attributes.

Answer 4

A solution to the first two of these problems
(untestable definitions and overlapping concerns) is
to use quality attribute scenarios as a means of
characterizing quality attributes.

Question 5

What are the 6 parts of the quality attribute scenarios?

Answer 5

1. Stimulus
2. Stimulus source
3. Response
4. Response measure
5. Environment
6. Artifact

Question 6

What is an architectural pattern?

Answer 6

a recurring
design problem that arises in specific design
contexts and presents a well-proven
architectural solution for the problem

Question 7

What three reasons support the use of tactics?

Answer 7

1. But patterns are often difficult to apply as is;
   architects need to modify and adapt them. By
   understanding tactics, an architect can assess options for
   augmenting an existing pattern to achieve a quality
   attribute goal.
   2.tactics allow the architect to construct a design fragment
   from “first principles”.
2. making design and analysis more
   systematic