Dynamic integrated assignment and demand modelling

DIADEM (Dynamic Integrated Assignment and DEmand Modelling) is software designed to enable practitioners to easily set up variable demand models that are consistent with the advice in WebTAG.

Purchasing DIADEM

Price list

Type of use Licence fee (£)
Commercial use within the EU £1000
Educational use within the EU £300
Commercial use outwith the EU £2000
Educational use outwith the EU £500


Prices exclude VAT. Prices are per site licence; this permits installation and use on an unlimited number of computers on the same site. Price includes technical support and minor upgrades. Additional fees may be charged for major upgrades. There is no annual maintenance fee. Local authorities must pay the commercial price. Within/outside the EU is defined by the location of the project for which DIADEM is being used, rather than the location of the user, e.g. a UK user working on a project in the Bahamas would have to pay £2000. All prices are set by the Department for Transport.


There are three payment options:

  • Send us an official purchase order. On receipt of this we will despatch the software immediately and issue you with an invoice which must be paid within 30 days
  • Send us a cheque for the full amount, including VAT at the appropriate rate, made payable to Mott MacDonald, to Dee Wells at the address below. On receipt of your cheque we will despatch the software immediately and issue you with an invoice for your records
  • Ask us to issue an invoice. The software will be despatched when full payment has been received

When placing an order please let us know your full contact details, i.e. name, organisation, address, telephone number and e-mail address. Please also let us know the site address(es) at which the software will be installed

Dee Wells

Mott MacDonald

Stoneham Place

Stoneham Lane


Hampshire SO50 9NW

United Kingdom

T: +44 (0)2380 628778

F: +44 (0)2380 628801

E: diadem@mottmac.com


If you have any questions, problems or suggestions please contact the DIADEM help desk at Mott MacDonald: diadem@mottmac.com. All feedback on DIADEM is very welcome.

Guidance on all aspects of transport modelling, including assignment and variable demand modelling, can be found on WebTAG.

General enquiries about WebTAG, variable demand modelling and the interpretation of the guidance should be directed to ITEA division at the Department for Transport: itea@dft.gsi.gov.uk.