Software Engineering

1. Department of Collegiate and Technical Education
Week -6
Requirement Engineering & Modeling
Software Engineering Principles
and Practices
Computer Science and Engineering
Session 01
Computer Science & Engineering – 20CS44P

2. Computer Science & Engineering – 20CS44P
Overview
• The process of collecting the software requirement from
the client then understand, evaluate and document it is
called as requirement engineering.
• The goal of requirement engineering is to develop and
maintain sophisticated and descriptive ‘System
Requirements Specification’ document.

3. Computer Science & Engineering – 20CS44P
What Is Requirement ?
• Requirement is a condition or capability possessed by the
software or system component in order to solve a real world
problem.
• The requirements for a system are the descriptions of what
the system should do - the services that it provides and the
constraints on its operation.
• Requirements convey the expectations of users from the
software product.

4. Computer Science & Engineering – 20CS44P
Importance
• The requirement engineering provides a vision of the final
software
• Requirement engineering also helps in defining the scope of
the software
• It also helps in perceiving the cost of the final software
• It also helps in perceiving the schedule up to which the
software will be delivered to the customer.

5. Computer Science & Engineering – 20CS44P
Requirement types

6. Computer Science & Engineering – 20CS44P
Business Requirements
• Business requirements specify the software’s business
demand. The business requirement identifies why the
software is required, who will be the end-users of the
software, how the software will benefit its end users.
• The business requirement does specify the technicality of the
software i.e. how it should be implemented it focuses only
on what software must do for them.

7. Computer Science & Engineering – 20CS44P
Users Requirements
• User requirements are statements, in a natural language plus
diagrams, of what services the system is expected to provide
to system users and the constraints under which it must
operate.
• User requirements reflect the specific needs or expectations
of the software's customers.

8. Computer Science & Engineering – 20CS44P
Software Requirements
• Functional: Describe what the software must deliver and
what it must not.
• Non-Functional: Describe the non-behavioural aspects of
the system such as its scalability, reliability, performance,
security, its portability, reusability and flexibility.
• Domain Requirements: Describes the realm, area, group
for which the software is to be developed. Such as for
college, office, military, hospital, students, teachers, patients

9. Computer Science & Engineering – 20CS44P
Sources Of Requirements

10. Computer Science & Engineering – 20CS44P
• Stakeholders/Buyers : They are the persons responsible for
accepting and executing the software. They can be individual
individuals, organizations, trusts or even the government or
public of a country.
• User/Beneficiaries: These are the users of the product for
which the product is intended.
• Operators : They are the persons who work on the software
to make the services of the software available to its
beneficiaries or the end users.

11. Computer Science & Engineering – 20CS44P
• Domain Experts : They are professionals with experience
and expertise of the domain in which the software provides
its services, viz. insurance, financials, banking,
communication, data transfer, networking, etc.
• Developer: They are responsible for software design,
prototype development, and technical feasibility. They work
closely with the end-users, buyers, and application experts.

12. Computer Science & Engineering – 20CS44P
• Past Experience/Case Studies : An organization working in
the similar or same domain may provide its past experience
or even documented case studies
• Connected People/Machine/Environment : People
associated with software or environmental factors and IT
domain may give a lot of provide information about
constraints involved in development, development, its and
environment implications on software.

13. Computer Science & Engineering - 20CS44P
Automated : In the new generation of information technology
and software development paradigm, many automated and
semi-automated tools are available that allow for the
affirmation and management of the need for building the
system.
Tester : Testers are a good source of information about the
user’s behaviour or the predictive behaviour of the system’s
condition. continuous contact with real users for their input

14. Thank you
Computer Science & Engineering – 20CS44P
Chairperson: Smt. Usha D 136-Government Polytechnic, Bagepalli
Moderator :
Smt. Sunandadevi V K
109-136-Government Polytechnic,
Kalaburagi
Subject Rewiever
Smt. Suvarna Mahadev V M
136-Government Polytechnic, Bagepalli
Content Developers
1. LOHITH S Y
173-gpt, Harapanahalli
2. Raghavendra M 131 School of Mines KGF
3.Poornima Kebbepura R C 112, Gpt, Tumkur
4. O K MANJUNATHA 156 GPT MULBAGAL
5. JYOTHI B.K 177 GPT SIDDAPUR.
6. PALLAVI H S 169 GPT KGF
7. A V RADHIKA 149, GPT ,CHITRADURGA