BACS2033 T5

Question 1

The basic building blocks of Z-based specifications are _______

Accepted Answer

schemas

Question 2

In a model-based approach, system is specified in terms of a state model via mathematical constructs (e.g set, sequence)

Accepted Answer

True

Question 3

Why software engineers usually use more than one diagrams in preparing RD?

Accepted Answer

Different diagrams cover different, complementary views of the system

Question 4

Every data flow in Context diagram must appear in the corresponding DFD

Accepted Answer

True

Question 5

Name the diagram shown

Accepted Answer

R-net diagram

Question 6

In algebraic approach

Accepted Answer

Interfaces are often defined as abstract data types ("sort") or objects, Well-suited to specification of interfaces, especially found in large sys, System is described in terms of operations and their relationships

Question 7

Choose a possible message for (b).

Accepted Answer

EnterCustomerDetails()

Question 8

What would you include in "Chapter 1 Introduction" of your Requirement Document (RD)?

Accepted Answer

Definitions, acronyms, abbreviations, RD purpose, Product scope

Question 9

Why use diagrammatic approach on requirements documentation?

Accepted Answer

Easy to understand & communicate, Overview & structuring of important aspects, Surface-level analysis

Question 10

The advantages of natural language for requirement documentation (RD) are ____

Accepted Answer

Unlimited expressiveness, Communicability, No training required

Question 11

Formal specification approach is not normally used in requirements documentation because ___

Accepted Answer

Formal methods are hard to scale up to large systems, Time-to-market is now more important than software with low error, Other software engineering techniques successfully increase system quality, The scope of formal methods is limited

Question 12

What would you include in "Chapter 3 Specific Requirements" of your Requirement Document (RD)?

Accepted Answer

Software quality attributes, Design constraints, Performance requirements, Functional requirements, External interface requirements

Question 13

What is quality trade-off?

Accepted Answer

Users & developers must decide which attributes are important than others, Ø Different projects will demand different sets of quality attributes, Certain attributes combinations have inescapable trade-offs

Question 14

Z schemas identify ______ variables, and define _____ and operations in terms of those variables.

Accepted Answer

state, constraints

Question 15

In what project scenario is formal specification most applicable to?

Accepted Answer

Life-critical system, Mission-critical system

Question 16

Name the diagram shown

Accepted Answer

Entity-relationship diagram (ERD)

Question 17

The advantages of formal specification included __

Accepted Answer

Cost-effective where high system failure costs must be avoided, Reducing the number of faults in systems, Mathematical notations allow precise vocabulary, syntax & semantics

Question 18

What would you include in "Chapter 2 General Description" of your Requirement Document (RD)?

Accepted Answer

User characteristics, Product perspective, Product functions, General constraints, Assumptions & Dependencies

Question 19

Give a guideline for writing excellent requirements.

Accepted Answer

Write functional requirements from the perspective of user, Avoid incompleteness, Avoid ambiguity

Question 20

Which nonfunctional requirement (Performance) is more appropriate?

Accepted Answer

The sys shall have response time less than 30s to any authorization request

Question 21

Which nonfunctional requirement (Reliability) is more appropriate?

Accepted Answer

The sys shall have not more than 1 hr system down time in a day

Question 22

What is this diagram?

Accepted Answer

Data flow diagram

Question 23

What is this diagram?

Accepted Answer

Sequence diagram

BACS2033 T5

Questions 23

BACS2033 T5

Questions 23