Requirements Engineering

Question 1

Where does RE start?

Answer 1

Starts with defining a problem to be tackled.

Question 2

What is the key task of Problem Definition

Answer 2

Formulating a well defined problem so it can be reasonably solved

Question 3

What is a stakeholder?

Answer 3

an Individual, Team, Organization with interests in, or concerns relating to the system to be

Question 4

Do all stakeholders coalesce harmoniously?

Answer 4

No, you will have to make compromises and tradeoffs to satisfy all different stakeholders.

Question 5

What are the components of RE?

Answer 5

• Requirements Elicitation.
• Requirements Analysis
• Requirements Specification

Question 6

Define Requirements Elicitation

Answer 6

Help customer define what’s required, what is to be accomplished, how the system fits their needs, and how it will be used on a daily basis.

Question 7

Define Requirements Analysis

Answer 7

Refining and modifying the gathered requirements

Question 8

Define Requirements Specification

Answer 8

Documenting system requirements in a semi-formal or formal matter, to ensure clarity, consistency and completeness.

Question 9

What are the different types of requirements

Answer 9

• Functional

- Non-functional

Question 10

Define functional requirements

Answer 10

FRs are those that provide fundamental reason for the product’s existence.

Specifies what the product must do.

Question 11

Define non-functional requirements

Answer 11

Quality of the entire system.

• Look and feel
• Usability (ease of use/learning)
• Performance

Question 12

Define parts of the SRS

Answer 12

Open Issues
Off the shelf solutions (existing product, Ready made components, something to follow or copy)
New Problems (in the environment, existing users, limitations in the environment.)

Question 13

Properties of Requirements

Answer 13

Abstract
Unambiguous
Traceable
Validatable
Complete
Consistent

Question 14

Tools for Requirements?

Answer 14

Most popular tool is the Use Case modelling

Question 15

What are Use Cases?

Answer 15

step-by-step description of how a user will use a system to accomplish business goals.
Specifies what the system needs to accomplish.
Detailed use cases are written in usage scenarios or scripts.

Question 16

What is an Actor

Answer 16

Person or other system that interacts with a system.

There are:
Initiating actors who initiate the use case.
Supporting Actors help the system complete the use case
Offstage actor, passively participates in the use case.

Question 17

Detailed Use cases

Answer 17

Text stories that detail what happens when an actor attempts to obtain a service from a system.

A scenario is called a use case instance

Don’t mistake a use case for the diagram.

Question 18

Use case format

Answer 18

Req.
initiating actor
actor goal
participating actors
Pre cond.
Post cond.

Scenarios

Alt. scenarios

Question 19

Who is interested in the SRS?

Answer 19

• Customers and Users
• Developers
• Testers
• Project Management