CSE360 Tutorial 13

Introduction to Software Engineering
Requirement Engineering
(202206)

Transcript

1. CSE360
   Introduction to Software Engineering
   Lecture:
   Requirements Engineering
   Javier Gonzalez-Sanchez
   javiergs@asu.edu
   javiergs.engineering.asu.edu
   Office Hours: By appointment
   

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   Where we are?
   Process
   Requirements
   Concepts
   Specification
   Management
   Design
   Coding
   Testing
   Quality
   

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3. Concepts
   

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   Requirements Engineering
   

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   Concepts
   necessities
   requirements
   

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   Concepts
   necessities
   requirements
   functional
   requirement
   non-functional
   requirement
   

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7. Javier Gonzalez-Sanchez | CSE360 | Summer 2018 | 7
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   Functional Requirement
   a) services the system should provide,
   b) how the system should react to particular inputs, and
   c) how the system should behave in particular situations.
   d) May state what (reactions, behaviours, or services) the
   system should not do.
   

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   Examples
   • Search option given to user to search from various invoices.
   • User should be able to mail any report to management.
   • Users can be divided into groups and groups can be given
   separate rights.
   What about
   • Pac-man?
   • Blackboard?
   • MyASU?
   • Recitation Project 1?
   

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   Non-functional Requirement
   Non-functional requirements
   a) Constraints on the services or functions offered by the
   system, such as
   Standards to apply, development platform, timing
   constraints, constraints on the development process,
   etc.
   a) Quality attributes, such as
   performance specifications, robustness, usability, etc.
   

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10. Javier Gonzalez-Sanchez | CSE360 | Summer 2018 | 10
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    Examples (Quality)
    Property Measure
    Speed • Processed transactions/second
    • User/event response time
    • Screen refresh time
    Size • Mbytes
    • Number of ROM chips
    Ease of use • Training time
    • Number of help frames
    Reliability • Mean time to failure
    • Probability of unavailability
    • Rate of failure occurrence
    • Availability
    Robustness • Time to restart after failure
    • Percentage of events causing failure
    • Probability of data corruption on failure
    Portability • Percentage of target dependent statements
    • Number of target systems
    

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    Types of Non-Functional Requirements
    

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    INVEST in good requirements
    • Independent – loosely coupled with one another
    • Negotiable – Stories are what and why , not how ( 99% ).
    • Valuable – for the customer!
    • Estimatable – Effort/Cost of design, build, and test.
    • Small (sized appropriately)
    • Testable – pass or fail
    

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13. Product Backlog
    

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    Definition
    

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    Questions
    

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16. To be continued…
    

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    References
    • Somerville Chapter 3 and 4
    • Essential Scrum – Chapter 6.
    

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18. CSE 563 Software Requirements and Specification
    Javier Gonzalez-Sanchez, Ph.D.
    javiergs@asu.edu
    Fall 2022
    Copyright. These slides can only be used as study material for the class CSE563 at ASU.
    They cannot be distributed or used for another purpose.
    

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