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Requirements quality theoretical introduction

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Requirements quality theoretical introduction

  1. 1. Requirements qualityA theoretical introduction
  2. 2. Contents Current situation in sw development Why requirements are so important What is the quality target ARM project Requirements Quality Analyzer: RQA 2 Requirements quality (A theoretical introduction) - (C) The REUSE Company
  3. 3. Current situation in sw. development The Chaos report 2009 Successful Challenged Failed 24% 32% 44% 3 Requirements quality (A theoretical introduction) - (C) The REUSE Company
  4. 4. Why requirements are so importantSuccess key factors % of answers Based on requirements1. User Involvement 15.9%2. Executive Management Support 13.9%3. Clear Statement of Requirements 13.0% 13.0%4. Proper Planning 9.6%5. Realistic Expectations 8.2% 8.2 %6. Smaller Project Milestones 7.7%7. Competent Staff 7.2%8. Ownership 5.3%9. Clear Vision & Objectives 2.9 % 2.9%10. Hard-Working, Focused Staff 2.4%Other 13.9% +40% directly related to requirements 4 Requirements quality (A theoretical introduction) - (C) The REUSE Company
  5. 5. Why requirements are so important Requirements:  Should be signed as a contract between developer and customer  Are the basis for software design  Man role also during the testing phase 5 Requirements quality (A theoretical introduction) - (C) The REUSE Company
  6. 6. Why requirements are so important Software projects are more and more complex over the time The sooner a problem is tackled the less the solution costs Cost 200 200 150 100 50 50 15 30 1 3 10 0 6 Requirements quality (A theoretical introduction) - (C) The REUSE Company
  7. 7. What is the quality target According to IEEE Std. 830 – 1998:  Correct  Unambiguos  Complete  Consistent  Ranked (importance and stability)  Verifiable  Modifiable  Traceable 7 Requirements quality (A theoretical introduction) - (C) The REUSE Company
  8. 8. What is the quality target According to ESA PSS-05-03:  SR04 Each software requirement shall include an identifier.  SR05 Essential software requirements shall be marked as such.  SR06 For incremental delivery, each software requirement shall include a measure of priority so that the developer can decide the production schedule.  SR07 References that trace software requirements back to the URD shall accompany each software requirement.  SR08 Each software requirement shall be verifiable.  SR11 The SRD shall be complete.  SR12 The SRD shall cover all the requirements stated in the URD.  SR13 A table showing how user requirements correspond to software requirements shall be placed in the SRD.  SR14 The SRD shall be consistent.  SR15 The SRD shall not include implementation details or terminology, unless it has to be present as a constraint.  SR16 Descriptions of functions ... shall say what the software is to do, and must avoid saying how it is to be done.  SR17 The SRD shall avoid specifying the hardware or equipment, unless it is a constraint placed by the user. 8 Requirements quality (A theoretical introduction) - (C) The REUSE Company
  9. 9. What is the quality targetLetter Term Description S Specific Clear and simple: a single need M Measurable Can you measure whether the goal has been achieved or not A Aligned Is the goal aligned with the strategy of the company/development R Relevant Can be achieved with a realistic number of resources T Time-framed Clear time limits "I believe that this nation should commit itself to achieving the goal, before this decade is out, of landing a man on the Moon and returning him safely to Earth" 9 Requirements quality (A theoretical introduction) - (C) The REUSE Company
  10. 10. What is the quality target All these targets seem to be clear RM tools (e.g. DOORS or IRQA) help us in some cases:  Modifiable, traceable… But, let us double check these targets Are all these quality goals really unambiguous Spanish proverb: «In the blacksmith’s home wooden knife» 10 Requirements quality (A theoretical introduction) - (C) The REUSE Company
  11. 11. ARM project ARM:  Automated Requirement Measurement by NASA  «The objective of the ARM tool is to provide measures that can be used by project managers to assess the quality of a requirements specification document»  The ARM tool scans a requirements specification document for key words and phrases and generates a report file summarizing the specific quality indicators  The tool is not intended to evaluate the correctness of the specified requirements; it’s an aid to “writing the requirements right”, not “writing the right requirements”  ARM analyzes a whole specification, req by req, and is able to show which aspects of a requirement should be avoided 11 Requirements quality (A theoretical introduction) - (C) The REUSE Company
  12. 12. ARM project Objectively measured indicators vs. quality attributes 12 Requirements quality (A theoretical introduction) - (C) The REUSE Company
  13. 13. Requirements Quality Analyzer RQA (Requirements Quality Analyzer) is a tool by The REUSE Company In the same way as ARM, RQA try to obtain objective quality measurements RQA works, nowadays, in English and Spanish The main differences between RQA and ARM:  RQA includes much more metrics that ARM  RQA is fully connected to DOORS and IRQA  RQA is fully customizable  RQA uses linguistic capabilities and not keyword spotting  RQA uses semantic capabilities to provide global metrics  RQA allows you cicles of change text and assess quality as many times as needed 13 Requirements quality (A theoretical introduction) - (C) The REUSE Company
  14. 14. Requirements Quality Analyzer More information about Requirements Quality Analyzer:  http://www.reusecompany.com 14 Requirements quality (A theoretical introduction) - (C) The REUSE Company

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