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CMPT 275 Software Engineering

CMPT 275 Software Engineering. Requirements Analysis Phase Requirements Specification Activity. Project: Requirements Analysis. You will be using an object oriented paradigm for your class project Informal scenarios will be used to help you derive your software requirements specifications.

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CMPT 275 Software Engineering

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  1. CMPT 275Software Engineering Requirements Analysis Phase Requirements Specification Activity

  2. Project: Requirements Analysis • You will be using an object oriented paradigm for your class project • Informal scenarios will be used to help you derive your software requirements specifications

  3. Requirements Gathering/Specification 6 1 Project Description 2 Software Developer Client/User 5 Informal Scenarios 3 7 Questions 4 8 4 8 Requirements Specification Document 3 7 4 Client meeting Client requirements review meeting 8

  4. Project: Requirements Analysis • Requirements gathering and specification will allow you to build an ‘analysis model’. This model represents the user’s/client’s view of the system • You will end up with a list of functional requirements. • Each requirement will represent one function/activity • This is your ‘analysis model’ • Functional requirements are not dependent on specific methods of implementation

  5. Project: Requirements Analysis • Your list of functional requirements will • Describe the required interactions between the system and its environment (independent of implementation) • You will also need a list of non-functional requirements • QUALITY REQUIREMENTS: Usability, reliability, performance, maintainability • CONSTRAINTS or PSEUDO REQUIREMENTS: Implementation (tools, languages), interface (to external systems), operation (admin, management), packaging, Legal

  6. Project: Requirements Analysis • You requirements must be • Complete: all required features must be described • Consistent: no two requirements in the specification may contradict each other • Unambiguous: no requirement can be interpreted in two different and contradictory ways • Correct: Only features desired by the client / developer are included not unintended extra features (problems)

  7. Project: Requirements Analysis • Later you will proceed using use case centered development (UCCD) to analyze your requirements and assure that they are complete consistent, unambiguous and correct • System context diagram • Identifying actors • Identifying Primary classes (initial analysis objects) • Identifying Scenarios and Use Cases • Identifying Relationships between use cases and actors. Using these relationships to build the use case diagram • Identifying relationships between classes and building a Class (object) diagram

  8. Project Deliverable #2 - #4 • Deliverable #2 is a partial Requirements Specification Document, version 1 • Deliverable #3 is a “client requirements review" done with your client • Deliverable #4 is a completed System Requirements Specification (SRS)

  9. Steps in requirements analysis - 1 • For your project • Clarify requirements in your first client meeting • Write a list of requirements in the needed format (discussed later), to be included in deliverable 2 • Begin your requirements analysis based on the list of requirements you made for deliverable 2 • Your requirements analysis will be added to the SRS you submitted as deliverable 2 (remember to update your revision history and requirements) to give the SRS you will submit as deliverable 4

  10. Steps in requirements analysis - 2 • For your project • Your requirements analysis will also help you to determine a list of more detailed questions and a list of use cases you can use to explain the context of those questions • Your requirements review meeting will allow your group to present the use cases you developed and ask the related detailed questions • Use the information you discover in the requirements review meeting to update the requirements analysis already added to your SRS before submitting your SRS as deliverable 5

  11. SRS format for your term project - 1 • Cover Page 2 • Revision History 2 • Table of contents 2 • Requirements Specification 2 • Functional Requirements • Prioritization of Functional Requirements • Non-Functional Requirements (numbers indicate first deliverable in which the contents of the section are included.)

  12. SRS format for your term project - 2 • Requirements Analysis • Scenarios (not “informal scenarios”) 4 • Use Cases 4 • Use Case diagram 4 • Class diagram 4 • User Interface Description 4 • All sections prepared in deliverable 3 must be updated as necessary and included in deliverable 5

  13. Requirements Specification • Format: • Requirements specifications are given in a structured format • requirements are numbered. • Finer details are shown as subsections • Finer details within subsections are shown as subsections of subsections ... • Functional and non-functional requirements are listed separately. Both lists use the same format. • For your term project you will compile a detailed list of functional and a detailed list of non-functional requirements using this format. These lists can then be checked for traceability.

  14. List of Requirements • The requirements you discover become part of a document • Documents are important, so you can refer to them and so new members and other members can refer to them • The software engineering document that includes the project requirements is usually called the Software Requirements Specification Document or SRS

  15. An example system • A system that manages an election • The system tabulates the votes that the voters have cast • The system determines who has won the election • The system archives information about candidates (people competing in the election), and about people managing the election

  16. Example: Functional Requirements • Update Riding Information 1.1 An election official can update any or all of the following information for any chosen riding: 1.1.1 The names of a candidate 1.1.1.1 The party affiliations of that candidate 1.1.2 A map of the riding 1.1.3 The number of eligible voters in the riding 1.1.4 The number of representatives for the riding 1.2 An elections official will update one riding at a time 1.3 An elections official may preview her changes before saving them in the riding repository

  17. Format for your SRS • Please use the format on the previous slide for the requirements in your SRS

  18. Clarifying the Requirements: • Other questions need to be answered to specify detailed requirements. For example: • What sort of Human computer interface is needed? • Are there any other pieces of data that need to be recorded or updated? • What is the maximum number of candidates in a riding? • Can the same candidate run in more than one riding? • And so on • Answers to such questions may raise additional questions so this is by nature an iterative process

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