the documented requirements and models are consistent and meet the stakeholder's needs. Only if the final draft passes the validation process, the RS becomes official. Requirements management – Managing all the activities related to the requirements since inception, supervising as the system is developed, and even until after it is put into use (e. g., changes, extensions, etc.) These are sometimes presented as chronological stages although, in practice, there is considerable interleaving of these activities. Requirements engineering has been shown to clearly contribute to software project successes. Problems One limited study in Germany presented possible problems in implementing requirements engineering and asked respondents whether they agreed that they were actual problems. The results were not presented as being generalizable but suggested that the principal perceived problems were incomplete requirements, moving targets, and time boxing, with lesser problems being communications flaws, lack of traceability, terminological problems, and unclear responsibilities. Criticism Problem structuring, a key aspect of requirements engineering, has been speculated to reduce design performance. Some research suggests that it is possible if there are deficiencies in the requirements engineering process resulting in a situation where requirements do not exist, software requirements may be created regardless as an illusion misrepresenting design decisions as requirements See also List of requirements engineering tools Requirements analysis, requirements engineering focused in software engineering. Requirements Engineering Specialist Group (RESG) International Requirements Engineering Board (IREB) International Council on Systems Engineering (INCOSE) IEEE 12207 "Systems and software engineering – Software life cycle processes" TOGAF (Chapter 17) Concept of operations (ConOps) Operations management Software requirements Software requirements specification Software Engineering Body of Knowledge (SWEBOK) Design specification Specification (technical standard) Formal specification Software Quality Quality Management Scope Management References External links ("This standard replaces IEEE 830–1998, IEEE 1233–1998, IEEE 1362-1998 - http://standards.ieee.org/findstds/standard/29148-2011.html") Systems Engineering Body of Knowledge Requirements Engineering Management Handbook by FAA International Requirements Engineering Board (IREB) IBM Rational Resource Library by IEEE Spectrum Systems engineering Software requirements IEEE standards ISO/IEC standards