CS510 Final Term Notes by Wahab Ahmad

CS510 Software Requirements and Specification Final term Syllabus Short Notes for Exams Preparation Week 1 to Week 15 By

Wahab Ahmad (BS Software Engineering)

Why this course needed?

• Let’s visualize how it is difficult to understand others point of view
• To understand the role of Software Requirement and Specification (SRS) in software projects.
• To understand the essential nature of SRS.
• To study current techniques, notations, methods, processes and tools used in SRS.
• To gain practical experience in writing of the SRS document

Software Requirement basic concepts

What, Why and Who

SRS processes

Sequence of activities that need to be performed in the requirement phase

Requirement Elicitation

Process of discovering, Reviewing, documenting, and understanding the user's needs and constraints for the system

Requirement Modelling

Visualization of requirements for better understanding and analysis

Requirement Analysis

Refining the user's needs and constraints

Requirement Specification

Process of documenting the user's needs and constraints clearly and precisely

Requirement verification and validation

Process of ensuring that system requirements are complete, correct, consistent, and clear

Requirement Management

Scheduling, coordinating, and documenting the requirements engineering activities

Requirement Traceability

If the source of the requirements can be identified

What is a Requirement?

• Something required, something wanted or needed
• A statement of a system service or constraint
• A condition or capability that must be possessed by a system (IEEE)

Why requirement is needed?

• Requirements form the basis for all software products

Requirement Challenges

 Challenges

• Necessarily involves people interaction
• Cannot be automated

 Why it is hard to Understand Requirements?

• Visualizing a future system is difficult
• Capability of the future system not clear, hence needs not clear
• Requirements change with time

Requirement Task

 Input

• Users need in mind of people

 Output

• precise statement of what the future system will do

Requirement Examples

• The system shall allow users to search for an item by title, author, or by International Standard Book Number
• The system’s user interface shall be implemented using a web browser

Requirement Engineering (RE)

 What is a Requirement Engineering?

• Requirement Engineering is a new area which is started in 1993.
• The first International symposium was held On RE in 1993.
• It is the process, which is used to determine the requirements for a software product systematically.