iv & v - requirements engineering and system modelling

Question 2

Requirements for a software system set out what the system [1] and define [2].

Answer 2

1. should do
2. constraints on its operation and implementation

Question 3

are statements of the services that the system must provide or are descriptions of how some computations must be carried out.

Answer 3

Functional requirements

Question 4

often constrain the system being developed and the development process being used. These might be product requirements, organizational requirements, or external requirements. They often relate to the emergent properties of the system and therefore apply to the system as a whole.

Answer 4

Non-functional requirements

Question 5

The [1] is an agreed statement of the system requirements. It should be organized so that both system customers and software developers can use it.

Answer 5

software requirements document

Question 6

enumeration

The requirements engineering process includes…

Answer 6

• feasibility study
• requirements elicitation and analysis
• requirements specification
• requirements validation
• requirements management

Question 7

is an iterative process that can be represented as a spiral
of activities—requirements discovery, requirements classification and organization, requirements negotiation, and requirements documentation.

Answer 7

Requirements elicitation and analysis

Question 8

is the process of checking the requirements for validity, consistency, completeness, realism, and verifiability.

Answer 8

Requirements validation

Question 9

Business, organizational, and technical changes inevitably lead to changes to the requirements for a software system. [1] is the process of managing and controlling these changes.

Answer 9

Requirements management

Question 10

A [1] is an abstract view of a system that ignores some system details. [2] models can be developed to show the system’s context, interactions, structure, and behavior.

Answer 10

1. model
2. Complementary system

Question 11

[1] show how a system that is being modeled is positioned in an environment with other systems and processes. They help define the boundaries of the system to be developed.

Answer 11

Context models

Question 12

[1] are used to describe the interactions between user the system being designed and users/other systems. [2] describe interactions between a system and external actors; [3] add more information to these by showing interactions between system objects.

Answer 12

1. Use case diagrams and sequence diagrams
2. Use cases
3. sequence diagrams

Question 13

[1] show the organization and architecture of a system. [2] are used to define the static structure of classes in a system and their associations.

Answer 13

1. Structural models
2. Class diagrams

Question 14

are used to describe the dynamic behavior of an executing system. This can be modeled from the perspective of the data processed by the system or by the events that stimulate responses from a system.

Answer 14

Behavioral models

Question 15

may be used to model the processing of data, where each activity represents one process step.

Answer 15

Activity diagrams

Question 16

are used to model a system’s behavior in response to internal or external events.

Answer 16

State diagrams

Question 17

is an approach to software development in which a system is represented as a set of models that can be automatically transformed to executable code.

Answer 17

Model-driven engineering