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CSE360 Tutorial 13

CSE360 Tutorial 13

Introduction to Software Engineering
Requirement Engineering
(202206)

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

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  2. Javier Gonzalez-Sanchez | CSE360 | Summer 2018 | 2
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    Where we are?
    Process
    Requirements
    Concepts
    Specification
    Management
    Design
    Coding
    Testing
    Quality

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  3. Javier Gonzalez-Sanchez | CSE360 | Summer 2018 | 4
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    Requirements Engineering

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  4. Javier Gonzalez-Sanchez | CSE360 | Summer 2018 | 5
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    Concepts
    necessities
    requirements

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  5. Javier Gonzalez-Sanchez | CSE360 | Summer 2018 | 6
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    Concepts
    necessities
    requirements
    functional
    requirement
    non-functional
    requirement

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  6. 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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  7. Javier Gonzalez-Sanchez | CSE360 | Summer 2018 | 8
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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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  8. Javier Gonzalez-Sanchez | CSE360 | Summer 2018 | 9
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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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  9. 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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  10. Javier Gonzalez-Sanchez | CSE360 | Summer 2018 | 11
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    Types of Non-Functional Requirements

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  11. Javier Gonzalez-Sanchez | CSE360 | Summer 2018 | 12
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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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  12. Product Backlog

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    Definition

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    Questions

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  15. To be continued…

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  16. Javier Gonzalez-Sanchez | CSE360 | Summer 2018 | 17
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    References
    • Somerville Chapter 3 and 4
    • Essential Scrum – Chapter 6.

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  17. CSE 563 Software Requirements and Specification
    Javier Gonzalez-Sanchez, Ph.D.
    [email protected]
    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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