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Database: 365,228(8 Aug 2026)

Concepts of Metrics and Measurement

Concepts of Metrics and Measurement, Total:250 items.

The international standard classification for "Concepts of Metrics and Measurement" includes: Aircraft and space vehicles in general , Energy and heat transfer engineering in general , Software development and system documentation .

The Chinese standard classification for "Concepts of Metrics and Measurement" includes: Basic standards and general methods , Terms and Symbols , Industrial automation and control device in general , Technical management , Software engineering .


General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China

  • GB/T 17781-1999 Technical energy systems--Basic concepts
  • GB/T 14410.4-1993 Flight mechanics-Concepts,quantities and symbols Flight performance
  • GB/T 18491.1-2001 Information technology - Software measurement - Functional size measurement - Part 1: Definition of concepts
  • GB/T 14410.5-2008 Flight mechanics - Concepts quantities and symbols - Part 5: Flight measurements
  • GB/T 14410.5-1993 Flight mechanics-Concepts,quantities and symbols Flight measurements
  • GB/T 42381.8-2023 Data quality―Part 8:Information and data quality:Concepts and measuring

Professional Standard - Aviation

  • HB 6445.5-1990 Flight dynamics concepts, quantities and symbolic flight measurements

German Institute for Standardization

  • DIN 55350-13:1987 Concepts in quality and statistics; concepts relating to the accuracy of methods of determination and of results of determination
  • DIN 55350-17:1988 Concepts in quality and statistics; concepts relating to quality inspection and test
  • DIN 58963-1:1990-05 Optical cells for photometric measurements; concepts
  • DIN 58963-1:1990 Optical cells for photometric measurements; concepts
  • DIN 55350-11 E:2007-03 Concepts on quality and statistics - Part 11: Concepts of the quality management
  • DIN 55350-17:1988-08 Concepts in quality and statistics; concepts relating to quality inspection and test
  • DIN 55350-11:1995 Concepts on quality and statistics - Part 11: Concepts of the quality management
  • DIN 18709-3:1982 Concepts, abbreviations and symbols in surveying; hydrographic surveying
  • DIN 1306:1967 Density; concepts, presentation of values
  • DIN 1306:1984 Density; concepts, presentation of values
  • DIN 4512-7:1993 Photographic sensitometry, determination of optical density; concepts, symbols and notations
  • DIN 1306:1971 Density; concepts, presentation of values
  • DIN 18709 Supplement 1:1997 Concepts, abbreviations and symbols in surveying - Index
  • DIN 40146-3:1978 Concepts in communication measurement and test signals
  • DIN 55350 E:2020-09 Concepts for quality management
  • DIN 55350:2021 Concepts for quality management
  • DIN 18709-3:1982-07 Concepts, abbreviations and symbols in surveying; hydrographic surveying
  • DIN 55350-31:1985 Concepts of quality management and statistics; concepts of acceptance sampling inspection
  • DIN 55350-13:1987-07 Concepts in quality and statistics; concepts relating to the accuracy of methods of determination and of results of determination
  • DIN 1303:1959 Vectors, matrices, tensors; symbols and concepts
  • DIN 1303:1987 Vectors, matrices, tensors; symbols and concepts
  • DIN 1303:1987-03 Vectors, matrices, tensors; symbols and concepts
  • DIN 18709 Supplement 1:1997-01 Concepts, abbreviations and symbols in surveying - Index
  • DIN 18709-2:1986 Concepts, abbreviations and symbols in surveying; surveying by the engineer
  • DIN 55350-15:1986-02 Concepts of quality management and statistics; concepts of types (models)
  • DIN 33402-1:1978 Body dimensions of people; terms and definitions, measuring procedures
  • DIN 18709-1 E:2019 Draft Document - Concepts, abbreviations and symbols in surveying - Part 1: General
  • DIN 55350-12:1989 Concepts in the field of quality and statistics; concepts relating to characteristics
  • DIN 18709-3:2012 Concepts, abbreviations and symbols in geodesy - Part 3: Hydrographic surveying
  • DIN 55350:2021-10 Concepts for quality management
  • DIN 18709-1 E:2019-03 Concepts, abbreviations and symbols in geodesy - Part 1: General
  • DIN 18709-1:2020 Concepts, abbreviations and symbols in geodesy - Part 1: General
  • DIN 55350-12:1989-03 Concepts in the field of quality and statistics; concepts relating to characteristics
  • DIN ISO 6879:1996-12 Air quality Performance characteristics of air quality measurement methods and related concepts
  • DIN 18709-1:2020-03 Concepts, abbreviations and symbols in geodesy - Part 1: General
  • DIN 55350-31:1985-12 Concepts of quality management and statistics; concepts of acceptance sampling inspection
  • DIN 55350-33:1993 Concepts to quality management and statistics; concepts of statistical process control (SPC)
  • DIN 55350-33:1993-09 Concepts to quality management and statistics; concepts of statistical process control (SPC)
  • DIN EN ISO 8402 Beiblatt 1:1995 Quality Management and Quality Assurance Concept Notes
  • DIN 55350-18:1987-07 Concepts in quality and statistics; concepts relating to certificates on results of quality inspections; quality inspection certificates
  • DIN 18709-3:2012-10 Concepts, abbreviations and symbols in geodesy - Part 3: Hydrographic surveying
  • DIN 55350-15:1986 Concepts of quality management and statistics; concepts of types (models)
  • DIN 1341:1986-10 Heat transfer; concepts, dimensionless parameters
  • DIN 1341:1971 Heat transfer; concepts, dimensionless parameters
  • DIN 18716-3:1997 Photogrammetry and remote sensing - Part 3: Remote sensing terms
  • DIN 70020-5:1986 Automotive engineering; tyres and wheels; concepts and measuring conditions
  • DIN 18709-4:1984-01 Concepts, abbreviations and symbols in surveying; calculus of observations and statistics
  • DIN 55350:2020-09 Draft Document - Concepts for quality management and statistics - Quality management
  • DIN 18709 Beiblatt 1:1997 Index of usage of concepts, abbreviations and symbols in metrology
  • DIN 18709-3 E:2012-01 Draft Document - Concepts, abbreviations and symbols in geodesy - Part 3: Hydrographic surveying
  • DIN 18709-3 E:2012 Draft Document - Concepts, abbreviations and symbols in geodesy - Part 3: Hydrographic surveying
  • DIN 18709-2:2020-03 Concepts, abbreviations and symbols in geodesy - Part 2: Engineering geodesy
  • DIN 13317:1983 Mechanics of rigid bodies; concepts, quantities, symbols
  • DIN 70020-5:1986-12 Automotive engineering; tyres and wheels; concepts and measuring conditions
  • DIN 18709-2 E:2019-03 Concepts, abbreviations and symbols in geodesy - Part 2: Engineering geodesy
  • DIN 40148-1:1978-11 Transmissionsystems and twoports; concepts and quantities
  • DIN 32878:1993-06 Angular displacement measuring systems with absolute and incremental encoders; concepts, requirements, testing
  • DIN 18709-2:2020 Concepts, abbreviations and symbols in geodesy - Part 2: Engineering geodesy
  • DIN 2257-1:1982 Terminology used in dimensional metrology; Units, activities, checking instruments; Metrological concepts
  • DIN 1305:1968 Mass, as weighed value, force, weight force, weight, load; concepts
  • DIN V 32938:1998 Surface profiling by means of optical microscopic methods - Concepts and measurement procedures
  • DIN 18709-1:2019-03 Draft Document - Concepts, abbreviations and symbols in surveying - Part 1: General
  • DIN 1305:1988-01 Mass, as weighed value, force, weight force, weight, load; concepts
  • DIN 18709-1:1995 Concepts, abbreviations and symbols in surveying - Part 1: General
  • DIN 13317:1983-01 Mechanics of rigid bodies; concepts, quantities, symbols
  • DIN 55350 E:2020 Draft Document - Concepts for quality management and statistics - Quality management
  • DIN 18709-4:1984 Concepts, abbreviations and symbols in surveying; calculus of observations and statistics
  • DIN 1305:1988 Mass, as weighed value, force, weight force, weight, load; concepts
  • DIN 863-1:1999-04 Micrometers - Standard design external micrometers - Concepts, requirements and testing
  • DIN EN ISO 14978:2006 Geometrical product specifikations (GPS) - General concepts and requirements for GPS measuring equipment (ISO 14978:2006); English version of DIN EN ISO 14978:2006-11
  • DIN EN ISO 14978:2019-06 Geometrical product specifications (GPS) - General concepts and requirements for GPS measuring equipment (ISO 14978:2018); German version EN ISO 14978:2018
  • DIN 18709-2:2019-03 Draft Document - Concepts, abbreviations and symbols in geodesy - Part 2: Engineering geodesy
  • DIN 18709-2 E:2019 Draft Document - Concepts, abbreviations and symbols in geodesy - Part 2: Engineering geodesy
  • DIN 18709-6 E:2015-04 Concepts, abbreviations and symbols in geodesy - Part 6: Geodetic reference systems and reference surfaces
  • DIN 18709-6 E:2020-03 Concepts, abbreviations and symbols in geodesy - Part 6: Geodetic reference systems and reference surfaces
  • DIN 18709-6:2021-04 Concepts, abbreviations and symbols in geodesy - Part 6: Geodetic reference systems and reference surfaces
  • DIN 32878:1993 Angular displacement measuring systems with absolute and incremental encoders; concepts, requirements, testing

Austrian Standards

Magyar Szabványügyi Testület

Swiss Association for Standardization (SNV)

British Standards Institution (BSI)

  • BS ISO 8000-8:2015 Data quality. Information and data quality: Concepts and measuring
  • BS ISO/IEC 14143-1:1998 Information technology. Software measurement. Functional size measurement-Definition of concepts
  • BS ISO 6879:1996 Air quality - Performance characteristics and related concepts for air quality measuring methods
  • BS ISO 6879:1995(1999) Air quality — Performance characteristics and related concepts for air quality measuring methods
  • BS ISO 6879:1995 Air quality. Performance characteristics and related concepts for air quality measuring methods
  • BS EN ISO 20785-1:2017 Dosimetry for exposures to cosmic radiation in civilian aircraft-Conceptual basis for measurements
  • BS ISO/IEC 14143-1:2007 Information technology - Software measurement - Functional size measurement - Definition of concepts
  • BS ISO/IEC 14143-1:2008 Information technology. Software measurement. Functional size measurement. Definition of concepts
  • BS EN ISO 20785-1:2020 Dosimetry for exposures to cosmic radiation in civilian aircraft - Conceptual basis for measurements
  • BS ISO 20785-1:2012 Dosimetry for exposures to cosmic radiation in civilian aircraft. Conceptual basis for measurements
  • BS 4778-2:1991 Quality vocabulary - Quality concepts and related definitions
  • BS EN ISO 14978:2018 Geometrical product specifications (GPS). General concepts and requirements for GPS measuring equipment
  • BS EN ISO 14978:2006 Geometrical Product Specifications (GPS). General concepts and requirements for GPS measuring equipment
  • BS ISO/IEC 14143-1:2007(2012) Information technology — Software measurement — Functional size measurement — Part 1 : Definition of concepts
  • BS EN ISO 14978:2007 Geometrical Product Specifications (GPS) - General concepts and requirements for GPS measuring equipment

Danish Standards Foundation

  • DS 13000:2007 Measurement of buildings, concepts of area and volume
  • DANSK DS/ISO 8000-8:2015 Data quality - Part 8: Information and data quality: Concepts and measuring
  • DS/ISO/IEC 14143-1/Cor 1:2012 Information technology - Software measurement - Functional size measurement - Part 1: Definition of concepts
  • DS/ISO/IEC 14143-1:2007 Information technology - Software measurement - Functional size measurement - Part 1: Definition of concepts
  • DS 13000:2021 Measurement of buildings, concepts of area and volume – CORRECTIONS 1
  • DANSK DS/ISO/IEC 14143-1:2007 Information technology - Software measurement - Functional size measurement - Part 1: Definition of concepts
  • DANSK DS/ISO/IEC 14143-1/COR 1:2007 Information technology - Software measurement - Functional size measurement - Part 1: Definition of concepts
  • DS/EN ISO 14978:2006 Geometrical Product Specifications (GPS) - General concepts and requirements for GPS measuring equipment
  • DANSK DS/IEC/TS 62654:2012 Network-based energy consumption measurement - Energy saving system - Conceptual model
  • DS/IEC/TS 62654:2012 Network-based energy consumption measurement - Energy saving system - Conceptual model
  • DANSK DS/EN ISO 14978:2006 Geometrical Product Specifications (GPS) – General concepts and requirements for GPS measuring equipment
  • DS/EN ISO 14978/AC:2008 Geometrical Product Specifications (GPS) - General concepts and requirements for GPS measuring equipment
  • DANSK DS/ISO 20785-1:2020 Dosimetry for exposures to cosmic radiation in civilian aircraft – Part 1: Conceptual basis for measurements

International Organization for Standardization (ISO)

  • ISO 1151-5:1987 Flight dynamics; Concepts, quantities and symbols; Part 5 : Quantities used in measurements
  • ISO 1151-5:1974 Terms and symbols for flight dynamics — Part 5: Quantities used in measurements
  • ISO/IEC 14143-1:2007 Information technology - Software measurement - Functional size measurement - Part 1: Definition of concepts
  • ISO 8000-8:2015 Data quality - Part 8: Information and data quality: Concepts and measuring
  • ISO 6879:1983 Air quality; Performance characteristics and related concepts for air quality measuring methods
  • ISO 1151-8:1992 Flight dynamics; concepts, quantities and symbols; part 8: concepts and quantities used in the study of the dynamic behaviour of the aircraft
  • ISO/IEC 14143-1:1998 Information technology - Software measurement - Functional size measurement - Part 1: Definition of concepts
  • ISO 1151-4:1994 Flight dynamics - Concepts, quantities and symbols - Part 4: Concepts, quantities and symbols used in the study of aircraft stability and control
  • ISO 14978:2006 Geometrical product specifications (GPS) - General concepts and requirements for GPS measuring equipment
  • ISO 20785-1:2020 Dosimetry for exposures to cosmic radiation in civilian aircraft — Part 1: Conceptual basis for measurements
  • ISO 6879:1995 Air quality - Performance characteristics and related concepts for air quality measuring methods
  • ISO 13600:1997 Technical energy systems - Basic concepts
  • ISO 14978:2018 Geometrical product specifications (GPS) — General concepts and requirements for GPS measuring equipment

Association of German Mechanical Engineers

Spanish Association for Standardization (UNE)

  • AENOR UNE 4024:1954 FUNDAMENTAL NOTIONS IN QUANTITY METROTECHNICS
  • UNE-ISO 8000-8:2023 Data quality — Part 8: Information and data quality: Concepts and measuring
  • AENOR UNE 77207:2000 Air quality. Operating characteristics and related concepts for air quality measurement methods.
  • UNE 77207:2000 Air quality. Performance characteristics and related concepts for air quality measuring methods.
  • UNE 71045-1:2000 Inrormation technology. Software measurement. Functional size measurement. Part 1: Definition of concepts.
  • UNE-EN ISO 14978:2021 Geometrical product specifications (GPS) - General concepts and requirements for GPS measuring equipment (ISO 14978:2018)
  • UNE-EN ISO 20785-1:2020 Dosimetry for exposures to cosmic radiation in civilian aircraft - Part 1: Conceptual basis for measurements (ISO 20785-1:2020) (Endorsed by Asociación Española de Normalización in September of 2020.)

Korean Agency for Technology and Standards (KATS)

  • KS W ISO 1151-5:2007 Flight dynamics-Concepts, quantities and symbols-Part 5:Quantities used in measurements
  • KS X ISO 8000-8-2021 Data quality — Part 8: Information and data quality: Concepts and measuring
  • KS X ISO 8000-8:2021 Data quality — Part 8: Information and data quality: Concepts and measuring
  • KS W 0640-1993 Flight dynamics-Concepts,quantities and symbols-Part 5:Quantities used in measurements
  • KS W ISO 1151-5-2007(2012) Flight dynamics - Concepts, quantities and symbols - Part 5: Quantities used in measurements
  • KS I 2003-2005(2010) Air quality-Performance characteristics and related concepts for air quality measuring methods
  • KS W ISO 1151-8:2015 Flight dynamics - Concepts, quantities and symbols - Part 8: Concepts and quantities used in the study of the dynamic behaviour of the aircraft
  • KS W ISO 1151-8:2008 Flight dynamics-Concepts, quantities and symbols-Part 8:Concepts and quantities used in the study of the dynamic behaviour of the aircraft
  • KS W 0921-1997(2012) Flight dynamics - Concepts, quantities and symbols - Part 8 : Concepts and quantities used in the study of the dynamic behaviour of the aircraft
  • KS W 0921-1997 Flight dynamics - Concepts, quantities and symbols - Part 8 : Concepts and quantities used in the study of the dynamic behaviour of the aircraft
  • KS W ISO 1151-8-2008(2013) Flight dynamics - Concepts, quantities and symbols - Part 8: Concepts and quantities used in the study of the dynamic behaviour of the aircraft
  • KS W 0640-2008 FLIGHT DYNAMICS - CONCEPTS, QUANTITIES AND SYMBOLS - PART 5 :QUANTITIES USED IN MEASUREMENTS
  • KS W ISO 1151-4:2008 Flight dynamics-Concepts, quantities and symbols-Part 4:Concepts, quantities and symbols used in the study of aircraft stability and control
  • KS A ISO/IEC GUIDE 99-2018(2023) International vocabulary of metrology — Basic and general concepts and associated terms(VIM)
  • KS W 0640-2003 FLIGHT DYNAMICS - CONCEPTS, QUANTITIES AND SYMBOLS - PART 5 :QUANTITIES USED IN MEASUREMENTS
  • KS W ISO 1151-5-2015 Flight dynamics-Concepts, quantities and symbols-Part 5:Quantities used in measurements
  • KS W ISO 1151-8-2015 Flight dynamics - Concepts, quantities and symbols - Part 8: Concepts and quantities used in the study of the dynamic behaviour of the aircraft
  • KS W 0921-2013 Flight dynamics - Concepts, quantities and symbols - Part 8 : Concepts and quantities used in the study of the dynamic behaviour of the aircraft
  • KS I 2003-2005 Air quality-Performance characteristics and related concepts for air quality measuring methods
  • KS W ISO 1151-4-2015 Flight dynamics-Concepts, quantities and symbols-Part 4:Concepts, quantities and symbols used in the study of aircraft stability and control
  • KS X 2222-1-2001(2017) Information technology - Software measurement - Functional size measurement - Part 1: Definition of concepts
  • KS X 2222-1-2021 Information technology-Software measurement-Functional size measurement-Part 1:Definition of concepts
  • KS X 2222-1-2001(2021) Information technology-Software measurement-Functional size measurement-Part 1:Definition of concepts
  • KS X 2222-1-2001 Information technology-Software measurement-Functional size measurement-Part 1:Definition of concepts

Bureau of Indian Standards

  • IS/ISO 8000-8-2015 Data Quality - Part 8 Information and Data Quality-Concepts and Measuring

American Petroleum Institute (API)

COMMISSION FOR THE STANDARDS, METROLOGY AND QUALITY OF VIETNAM (STAMEQ)

  • TCVN 6500-1999 Air quality.Performance characteristics and related concepts for air quality measuring methods

South African Bureau of Standard

  • SANS 14143-1:1998 Information technology - Software measurement - Functional size measurement Part 1: Definition of concepts

Canadian Standards Association (CSA)

Indonesia Standards

  • SNI ISO 8000-8:2015 Data Quality – Part 8: Data and Information Quality: Concepts and Measurement

Japanese Industrial Standards Committee (JISC)

  • JIS W 0118:1995 Flight dynamics -- Concepts, quantities and symbols -- Part 8: Concepts and quantities used in the study of the dynamic behaviour of the aircraft
  • JIS X 0135-1:1999 Information technology -- Software measurement -- Functional size measurement -- Part 1: Definition of concepts
  • JIS X 0135-1:2010 Information technology -- Software measurement -- Functional size measurement -- Part 1: Definition of concepts
  • JIS B 0642:2022 Geometrical product specifications (GPS) -- General concepts and requirements for GPS measuring equipment
  • JIS W 0115:1992 Flight dynamics -- Concepts, quantities and symbols -- Part 5: Quantities used in measurements
  • JIS B 0642:2010 Geometrical product specifications (GPS) -- General concepts and requirements for GPS measuring equipment
  • JIS W 0114:2000 Flight dynamics -- Concepts, quantities and symbols -- Part 4: Concepts, quantities and symbols used in the study of aircraft stability and control

Ente Nazionale Italiano di Unificazione

  • UNI CEI 70099:2008 International vocabulary of metrology - Basic and general concepts and associated terms (VIM)
  • UNI 8475-P2-1983 Terminology and characteristics of cutting tools. Basic concepts of power, energy and intensity
  • UNI ISO/IEC 14143-1:2000 Information technology - Software measurement - Functional size measurement - Definition of concepts
  • UNI 8475-2:1983 Terminology and characteristics of cutting tools. Notion of forces, energy and power
  • UNI/TR 11326:2009 Acoustics - Evaluation of the uncertainty of measurements and calculations in acoustics - Parte 1: General concepts
  • UNI EN ISO 20785-1:2017 Dosimetry for exposures to cosmic radiation in civilian aircraft - Part 1: Conceptual basis for measurements
  • UNI EN ISO 20785-1:2020 Dosimetry for exposures to cosmic radiation in civilian aircraft - Part 1: Conceptual basis for measurements

Kingdom of Bahrain Testing and Metrology Directorate

  • BH GSO ISO 1151-5:2016 Flight dynamics -- Concepts, quantities and symbols -- Part 5: Quantities used in measurements
  • BH GSO ISO 1151-8:2016 Flight dynamics -- Concepts, quantities and symbols -- Part 8: Concepts and quantities used in the study of the dynamic behaviour of the aircraft
  • BH GSO ISO 1151-4:2016 Flight dynamics -- Concepts, quantities, and symbols -- Part 4: Concepts and quantities used in the study of aircraft stability and control

Gosstandart of Russia

  • GOST R ISO 6879-2005 Air quality. Performance characteristics and related concepts for air quality measuring methods
  • GOST R 56428-2015 Network-based energy consumption measurement. Energy saving system. Conceptual model

European Committee for Standardization (CEN)

  • EN ISO 14978:2018 Geometrical product specifications (GPS) - General concepts and requirements for GPS measuring equipment
  • EN ISO 14978:2006 Geometrical Product Specifications (GPS) - General concepts and requirements for GPS measuring equipment
  • EN ISO 20785-1:2017 Dosimetry for exposures to cosmic radiation in civilian aircraft - Part 1: Conceptual basis for measurements
  • EN ISO 20785-1:2020 Dosimetry for exposures to cosmic radiation in civilian aircraft - Part 1: Conceptual basis for measurements (ISO 20785-1:2020)

International Electrotechnical Commission (IEC)

  • IEC TS 62654:2012 Network-based energy consumption measurement - Energy saving system - Conceptual model

Association Francaise de Normalisation

  • NF E11-001:2006 Geometrical product specifications (GPS) - General concepts and requirements for GPS measuring equipment.
  • NF EN ISO 14978:2018 Geometrical Product Specification (GPS) – General Concepts and Requirements for GPS Measuring Equipment
  • NF E11-001*NF EN ISO 14978:2018 Geometrical product specifications (GPS) - General concepts and requirements for GPS measuring equipment

GCC Standardization Organization

  • GSO IEC TS 62654:2013 Network-based energy consumption measurement - Energy saving system - Conceptual model
  • GSO ISO 1151-5:2013 Flight dynamics -- Concepts, quantities and symbols -- Part 5: Quantities used in measurements
  • GSO ISO 1151-4:2013 Flight dynamics -- Concepts, quantities, and symbols -- Part 4: Concepts and quantities used in the study of aircraft stability and control
  • GSO ISO 1151-8:2013 Flight dynamics -- Concepts, quantities and symbols -- Part 8: Concepts and quantities used in the study of the dynamic behaviour of the aircraft
  • GSO ISO/IEC 14143-1:2010 Information technology — Software measurement — Functional size measurement - Part 1: Definition of concepts

American National Standards Institute (ANSI)

  • ANSI/IEEE 14143.1:2000 Information Technology - Software Measurement - Functional Size Measurement - Part 1: Definition of Concepts

The Directorate General of Specifications and Metrology (DGSM)

  • OS GSO IEC 62654:2013 Network-based energy consumption measurement - Energy saving system - Conceptual model

Swedish Institute for Standards

  • SS-ISO 20785-1:2006 Dosimetry for exposures to cosmic radiation in civilian aircraft - Part 1: Conceptual basis for measurement

Institute of Electrical and Electronics Engineers (IEEE)

  • IEEE Std 14143.1-2000 Implementation Note for IEEE Adoption of ISO/IEC 14143-1:1998 Information Technology---Software Measurement---Functional Size Measurement---Part 1: Definition of Concepts