Dynamic integrated assignment and demand modelling (DIADEM) software

How to access, use and purchase the DIADEM software which links SATURN assignment models to a variable transport demand model.


DIADEM software


DIADEM is a software tool that enables users to easily set-up variable demand models in accordance with the advice provided in TAG unit M2 variable demand modelling.

The main demand model used in DIADEM is an incremental hierarchical logit model of the following demand responses:

  • trip frequency
  • time period choice
  • mode choice
  • destination choice/distribution

Travel times and other costs are provided by a third party traffic assignment model, with interfaces provided for SATURN.

Purchasing DIADEM

All prices exclude VAT, which will be applied at the prevailing rate where appropriate.

Licence Type Licence fee per site Discounted price for every additional licence
Commercial use £1,750 £1,312.50
Educational use £350 £350

The licence enables the use of the software for an unlimited period of time and, within the first 12 months of purchase, access to:

  • technical support
  • updates to the software

A licence entitles a user to install multiple copies of the DIADEM software at a single site.

Additional copies, for use at other sites, may be obtained at a discounted rate if purchased as part of the same transaction.

An educational licence must only be used for educational purposes. Educational organisations must purchase a commercial license if undertaking paid research


There are 2 payment options:

  • send us an official purchase order, software is dispatched within 2 working days, your invoice must be paid within 30 days of receipt
  • ask us to issue an invoice, software is dispatched after full payment, this option must be used for non-UK orders

Orders can be made by telephone on +44 (0) 1372 756 755 or email at

When placing an order you must supply your full contact details, including:

  • name
  • organisation name
  • address
  • telephone number
  • email address
  • the location at which the software will be installed

Downloading DIADEM

Users with a current DIADEM licence may download the software and the user manual with their user ID and password.


Questions, problems and suggestions about the software should be sent to the DIADEM support at Atkins with the subject DIADEM questions, problems and suggestions.

Published 9 October 2012
Last updated 1 August 2019 + show all updates
  1. DIADEM software version 7.0 released.

  2. First published.