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Guidance: TAG uncertainty toolkit

Department For Transport

April 19
08:43 2023

TAG uncertainty toolkit

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Forthcoming change: spring 2023 data book and guidance updates

Details

A toolkit that provides practical information on:

  • the analysis of uncertainty in modelling and appraisal
  • techniques for exploring that uncertainty in the context of future travel demand
  • how to present this data to decision makers
  • the common analytical scenarios, including narratives and how to apply them proportionately in transport business cases

It supplements TAG Unit M4: forecasting and uncertainty.

A Common analytical scenarios databook has also been published.

The previous version of this guidance was released in May 2021.

TAG provides information on the role of transport modelling and appraisal, and how the transport appraisal process supports the development of investment decisions to support a business case.

Published 19 May 2021
Last updated 19 April 2023 +show all updates
  1. Added forthcoming change: spring 2023 data book and guidance updates.

  2. DfT uncertainty toolkit updated.

  3. Forthcoming change to guidance note added, giving details of updates to be made in November 2022.

  4. First published.

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