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  • Marriages and civil partnerships in England and Wales QMI

    Released on: 22 December 2025 | Methodology

    Quality and methodology information for marriage and civil partnership formation statistics, detailing the strengths and limitations of the data, methods used and data uses and users.

  • Crime in England and Wales QMI

    Released on: 25 July 2025 | Methodology

    Quality and Methodology Information for crime levels and trends in England and Wales, detailing the strengths and limitations of the data, methods used, and data uses and users.

  • Regional and subregional labour productivity

    Released on: 21 July 2025 | Methodology

    Quality and methodology information (QMI) for regional and subregional labour productivity, detailing the strengths and limitations of the data, methods used, data uses and users.

  • Low Carbon and Renewable Energy Economy (LCREE) Survey QMI

    Released on: 09 July 2025 | Methodology

    Quality and methodology information for the Low Carbon and Renewable Energy Economy (LCREE) Survey, detailing methods used, data it provides, and strengths and limitations.

  • Management practices in the UK QMI

    Released on: 06 September 2024 | Methodology

    Quality and methodology information for the Management and Expectations Survey (MES), including strengths and limitations of the data, recent corrections, methods, and data uses and users.

  • Environmental accounts on energy use QMI

    Released on: 13 July 2023 | Methodology

    Quality and Methodology Information for energy use in the UK Environmental Accounts, detailing the strengths and limitations of the data, methods used, and data uses and users.

  • Environmental accounts on air emissions QMI

    Released on: 04 July 2023 | Methodology

    Quality and Methodology Information for air emissions in the UK Environmental Accounts, detailing the strengths and limitations of the data, methods used, and data uses and users.

  • Internet users QMI

    Released on: 18 January 2019 | Methodology

    Quality and Methodology Information for internet access - households and individuals statistics, detailing the strengths and limitations of the data, methods used, and data uses and users.

  • Considering the income question

    Released on: 18 January 2016 | Corporate Information

    Before excluding an income question on the 2011 Census, ONS considered the impact on response rates, field operations, public perception and the quality of data.

  • Data source overviews

    Released on: 10 November 2016 | Corporate Information

    Information on data sources included in the Administrative Data Census Research Outputs and being evaluated for use in the 2021 Census.