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CO2401 Software Development Lecture 1 Notes
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  • Course
  • Software Development (CO2401)
  • Institution
  • University Of Central Lancashire Preston (UClan)

This document contains comprehensive notes from Lecture 1 of the CO2401 course on Software Development. The lecture focuses on the critical process of understanding and defining system requirements, a foundational aspect of successful software development.

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Document information

  • August 22, 2024
  • 5
  • 2023/2024
  • Class notes
  • Muhammad alhassan
  • All classes

Subjects

  • computer science
  • software
  • development
  • university
  • computer
  • 2nd year
  • efficiency
  • lecture
  • cs
  • notes

Written for

  • University of Central Lancashire Preston (UClan)
  • Unknown
  • Software Development (CO2401)
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CO2401: Software Development
Lecture 1

Understanding Requirements
1. What Are Requirements?
o A requirement is a condition or capability that a system must
conform to or fulfil.
o It specifies what should be implemented in the system.

o Requirements can be viewed differently depending on the
stakeholder:
 Business Analyst: User requirements.
 Architect: Influences on the system’s design.
 Developers: Drives design choices.
2. Whose Requirement?
o A system's property that provides value to its stakeholder. To
understand requirements, one must understand the stakeholders,
which include:
 Users
 Developers
 Sponsors
Types of Requirements
1. User Requirements
o Statements in natural language plus diagrams of the services the
system provides and its operational constraints.
o Written for customers.



2. System Requirements
o A structured document detailing the system’s functions, services,
and operational constraints.
o Defines what should be implemented, often part of a contract
between client and contractor.

, 3. Examples
o User Requirement: The system shall generate monthly
management reports showing the cost of drugs prescribed by each
clinic.
o System Requirement: The system shall generate the report for
printing after 17:30 on the last working day of the month.
Agile Methods and Requirements
1. Overview
o Agile methods argue that producing detailed system requirements
may be unnecessary as requirements change rapidly.
o Incremental requirements engineering is used, often expressed as
"user stories."
2. Agile Methods
o Scrum, Kanban, and Extreme Programming (XP) are common
agile methods.
o While practical for business systems, agile methods can be
problematic for critical systems requiring pre-delivery analysis or
those developed by multiple teams.
Functional and Non-Functional Requirements
1. Functional Requirements
o Describe what the system should do, including system functions,
inputs, outputs, and behaviour in specific situations.
o Examples:

 A user shall be able to search the appointments list for all
clinics.
 Each staff member using the system shall be uniquely
identified by their 8-digit employee number.


2. Non-Functional Requirements
o Constraints on the services or functions offered by the system, such
as reliability, response time, and storage requirements.
o These requirements are often more critical than functional
requirements. If unmet, the system may be useless.
o Examples:

 Product requirement: The system shall implement patient
privacy provisions.

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