Requirements Validation and Verification
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What is the main objective of requirements validation?

  • To ensure that the SRS will meet the user requirements
  • To check the conformity to writing standards and rules
  • To ensure that the requirements are correctly derived from business requirements
  • To identify the intended system capabilities and properties (correct)

    • What is the primary difference between validation and verification?

  • Validation focuses on correctness, while verification focuses on quality (correct)
  • Validation is a single discrete phase, while verification is an ongoing process
  • Validation focuses on quality, while verification focuses on correctness
  • Validation is an ongoing process, while verification is a single discrete phase

    • What is the purpose of informal peer reviews?

  • To formally inspect the requirements for errors and inconsistencies
  • To systematically identify all requirements problems
  • To educate other people about the product and collect unstructured feedback (correct)
  • To provide a final quality gate prior to baselining a set of requirements

    • What is a limitation of informal peer reviews?

    <p>They are all of the above</p> Signup and view all the answers

    What is the primary benefit of reviewing requirements?

    <p>To identify requirements problems and inconsistencies</p> Signup and view all the answers

    When does validation occur in the requirements development process?

    <p>Throughout the iterative elicitation, analysis, and specification processes</p> Signup and view all the answers

    What is the first step in the inspection process?

    <p>Author and moderator plan together</p> Signup and view all the answers

    What percentage of defects are typically found during the inspection stage?

    <p>75%</p> Signup and view all the answers

    What is the purpose of the follow-up stage?

    <p>To verify that all open issues have been resolved</p> Signup and view all the answers

    What happens if major revisions are necessary?

    <p>The team elects to re-examine portions of the product</p> Signup and view all the answers

    What is the primary goal of the inspection process?

    <p>To satisfy the inspection exit criteria</p> Signup and view all the answers

    What is the final outcome of the inspection process?

    <p>The document is accepted as is</p> Signup and view all the answers

    What is the main purpose of requirements validation?

    <p>To determine whether the product satisfies customer needs</p> Signup and view all the answers

    What is verification in RE?

    <p>Determining if the product meets its requirements</p> Signup and view all the answers

    What is the difference between validation and verification?

    <p>Validation is for building the right product, verification is for building the product right</p> Signup and view all the answers

    When should requirements validation and verification be performed?

    <p>At every stage during RE</p> Signup and view all the answers

    What do validation and verification relate to?

    <p>Quality assurance</p> Signup and view all the answers

    What is the purpose of elicitation in validation?

    <p>To trace back to business objectives</p> Signup and view all the answers

    What is the purpose of a formal requirements review?

    <p>To produce a report that identifies the material examined and the reviewers</p> Signup and view all the answers

    What type of formal peer review is well-established at IBM?

    <p>Inspection</p> Signup and view all the answers

    What is the benefit of inspections in terms of labor hours?

    <p>Saves 10 hours of labor hours for every hour invested</p> Signup and view all the answers

    What is the role of a tester in an inspection?

    <p>To catch defective requirements</p> Signup and view all the answers

    Why is it important to have all necessary people in an inspection meeting?

    <p>To avoid correcting issues only to find out later that someone important disagrees</p> Signup and view all the answers

    What is the role of the moderator in an inspection?

    <p>To use the entry criteria as a checklist before deciding to proceed</p> Signup and view all the answers

    What is one of the entry criteria for an inspection?

    <p>The document has no obvious spelling or grammatical issues</p> Signup and view all the answers

    What is the purpose of the recorder in an inspection?

    <p>To capture defects found in an action item list</p> Signup and view all the answers

    How long should an inspection stage typically last?

    <p>Less than 2 hours</p> Signup and view all the answers

    What is the purpose of inspection participants?

    <p>To provide different perspectives on the document</p> Signup and view all the answers

    Study Notes

    Requirements Validation and Verification

    • Ensures that the requirements are correct, demonstrate the desired quality characteristics, and will satisfy customer needs
    • Both validation and verification are complementary processes related to the concepts of quality assurance
    • Validation assesses whether a product satisfies customer needs (doing the right thing)
    • Verification determines whether the product of some development activity meets its requirements (doing the thing right)

    Requirements Validation vs. Verification

    • Validation: "Are we building the right product?" - assessing whether you have written the right requirements
    • Verification: "Are we building the product right?" - determining whether the product meets its requirements

    Requirements Validation and Verification Processes

    • Need to be performed at every stage during RE: Elicitation, Analysis, Specification
    • Involves checking back with the elicitation sources, checking the correctness and consistency of the requirements, and checking conformity to writing standards, rules, etc.

    What are We Validating?

    • Requirements accurately describe the intended system capabilities and properties that will satisfy the various stakeholders' needs
    • Requirements are correctly derived from business requirements, system requirements, business rules, and other sources
    • Requirements are complete, feasible, and verifiable
    • All requirements are necessary, and the entire set is sufficient to meet the business objectives
    • All requirement representations are consistent with each other

    Validation Techniques

    • Reviews
    • Prototyping
    • Testing

    Reviews

    • Anytime someone other than the author of a work product examines the product for problems, a peer review is taking place
    • Reviewing requirements is a powerful technique for identifying requirements problems

    Informal Peer Reviews

    • Useful for educating other people about the product and collecting unstructured feedback
    • Not systematic, thorough, or performed in a consistent way
    • Approaches include:
      • Peer deskcheck
      • Passaround
      • Walkthrough

    Formal Peer Reviews

    • Follow a well-defined process
    • Produce a report that identifies the material examined, the reviewers, the review team's judgment as to whether the requirements are acceptable, and a summary of the defects found and the issues raised during the review
    • Best-established type of formal peer review is called an inspection

    Inspections

    • Developed by Michael Fagan at IBM
    • A well-defined multistage process that involves a small team of participants who carefully examine a work product for defects and improvement opportunities
    • Serve as a quality gate through which project deliverables must pass before they are baselined
    • Can be used for inspecting requirements documents and software

    Inspection Participants

    • Author of the work product
    • Tester
    • Project Manager
    • People responsible for interfacing systems that will be affected by the item being inspected
    • People who are the sources of information that into the item being inspected
    • People who will do work based on the item being inspected

    Inspection Roles

    • Author
    • Moderator
    • Reader
    • Recorder

    Inspection – Entry Criteria

    • Document conforms to the standard template and doesn't have obvious spelling, grammatical, or formatting issues
    • Line numbers or other unique identifiers are printed on the document to facilitate referring to specific locations
    • All open issues are marked as TBD (to be determined) or accessible in an issue-tracking tool
    • Moderator didn't find more than three major defects in a ten-minute examination of a representative sample of the document

    Inspection Stages

    • Reader leads inspector through document, describing one requirement at a time in their own words
    • Inspector brings up possible defects
    • Recorder captures them in action item list for the author
    • Team decides whether to Accept document as is, Accept w/ minor revisions, or Major revision needed

    Inspection – Exit Criteria

    • All issues raised during the inspection have been addressed
    • Any changes made in the requirements and related work products were made correctly
    • All open issues have been resolved, or each open issue's resolution process, target date, and owner have been documented

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    Learn about the importance of validation and verification in requirements engineering, and how they differ in ensuring customer needs are met.

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