Requirements quality - A theoretical introduction

229 views

Published on

Requirements quality theoretical introduction

Published in: Technology, Business
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
229
On SlideShare
0
From Embeds
0
Number of Embeds
1
Actions
Shares
0
Downloads
7
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

Requirements quality - A theoretical introduction

  1. 1. Requirements quality A 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 24% Challenged Failed 32% 44% 3 Requirements quality (A theoretical introduction) - (C) The REUSE Company
  4. 4. Why requirements are so important Success key factors % of answers 1. 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% Based on requirements +40% directly related to requirements 4 Requirements quality (A theoretical introduction) - (C) The REUSE Company
  5. 5. Why requirements are so important Requirements:     5 Should be signed as a contract between developer and customer Are the basis for software design Man role also during the testing phase 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 0 6 1 3 10 15 30 50 Requirements quality (A theoretical introduction) - (C) The REUSE Company
  7. 7. What is the quality target According to IEEE Std. 830 – 1998:          7 Correct Unambiguos Complete Consistent Ranked (importance and stability) Verifiable Modifiable Traceable Requirements quality (A theoretical introduction) - (C) The REUSE Company
  8. 8. What is the quality target According to ESA PSS-05-03:    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.  8 SR04 Each software requirement shall include an identifier. SR17 The SRD shall avoid specifying the hardware or equipment, unless it is a constraint placed by the user. Requirements quality (A theoretical introduction) - (C) The REUSE Company
  9. 9. What is the quality target Letter 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:      11 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 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:       13 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 Requirements quality (A theoretical introduction) - (C) The REUSE Company
  14. 14. Requirements Quality Analyzer  More information about Requirements Quality Analyzer:  14 http://www.reusecompany.com Requirements quality (A theoretical introduction) - (C) The REUSE Company

×