CSE563 Lecture 03

Software Requirements and Specification
Concepts II
(202201)

Transcript

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   CSE 563
   Software Requirements and Specification
   Lecture 03: Concepts II
   Dr. Javier Gonzalez-Sanchez
   javiergs@asu.edu
   javiergs.engineering.asu.edu | javiergs.com
   PERALTA 230U
   Office Hours: By appointment
   

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   Previously …
   

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   Concepts
   necessities
   requirements
   functional
   requirement
   non-functional
   requirement
   

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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!
   § Estimateable – Effort/Cost of design, build, and test.
   § Small (sized appropriately)
   § Testable – pass or fail
   

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   Functional vs Non-Functional
   

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   Functional Requirement
   a) May state what (reactions, behaviours, or services) the system
   should not do.
   b) services the system should provide,
   c) how the system should react to particular inputs, and
   d) how the system should behave in particular situations.
   

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   Examples
   a) Search option given to user to search from various invoices.
   b) User should be able to mail a report to management.
   c) Users can be divided into groups and groups can be given separate
   rights.
   d) Move the ghost in the Pac-man video game
   

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   Verbs (& subject)
   (actions)
   Careful with adjectives
   

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   Examples
   What about
   • A video game?
   • Canvas?
   • MyASU?
   • Facebook App?
   Independent
   Negotiable
   Valuable
   Estimateable
   Small
   Testable
   NOT VERY
   Small
   

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    Functional vs Non-Functional
    NON-Functional
    Functional
    Functional
    Functional
    

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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.
    b) Quality attributes, such as
    performance specifications, robustness, usability, etc.
    

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    Types of Non-Functional Requirements
    

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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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    Examples (Constraints)
    a) Should comply FERPA regulations.
    b) Software is developed keeping downward compatibility intact.
    c) Use Java as programming language
    

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    Adjectives
    (quality)
    Careful with verbs + adjectives
    

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    Independent
    Negotiable
    Valuable
    Estimateable
    Small
    Testable
    NOT VERY
    Small
    Examples (Quality or Constraints)
    What about
    • Pac-man?
    • Canvas?
    • MyASU?
    

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    Homework 01
    

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    Questions
    

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    CSE 563 Software Requirements and Specification
    Javier Gonzalez-Sanchez, Ph.D.
    javiergs@asu.edu
    Spring 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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