The OECD Harmonised Templates (OHTs) are standard data formats for reporting information used for the risk assessment of chemicals, mainly studies done on chemicals to determine their properties or effects on human health and the environment, but also for storing data on use and exposure. They are aimed at developers of database systems, as they prescribe the formats by which information can be entered into and maintained in a database. By using these templates, governments and industry are easily able to electronically exchange test study summary information.

The templates can be used to report summary test results for any type of chemical (e.g., pesticides, biocides, industrial chemicals, food/feed additives). The OECD Harmonised Templates cover endpoints and reporting elements which are grouped as follows:

Physico-chemical properties (incl. nanomaterials) - OHTs 1 to 23-5 & 101 to 113
Environmental fate and behaviour  - OHTs 24 to 40 & 401
Effects on biotic systems - OHTs 41 to 57
Health effects - OHTs 58 to 84 & 86
Pesticide residue chemistry - OHTs 85-1 to 85-10
Analytical methods - OHT 87
Efficacy - OHTs 88 & 89
Emissions from treated articles - OHT 90
Intermediate effects - OHT 201
Use and exposure information - OHTs 301 to 306
Generic elements for all OHTs

- Literature reference - Test material information                        - Reference substance - Chemical inventory

Each Template is accessible online in readable format (.doc file), with associated html schema (.xsd file), and with predefined tables and executive summaries (.html files) as available. The links to corresponding OECD Test Guidelines are given where applicable. 

All OHT materials can also be downloaded at once from a single zip file which collates the 130 OECD Harmonised Templates and their related materials. 

For more information and technical details on Templates see : IntroductionFormat and conventions used


Twenty-four revised Templates, one revised generic Template, and a set of changes applicable to all OHTs now available online (November 2021)

Twenty-one OHTs (29 and 30 from Series on Environmental Fate and Behaviour; 41, 42, 43, 44, 45, 46, 50-2, 52, 53, and 54 from Series on Effects on Biotic Systems; 59, 60, 62, 67, 68, and 78 from Series on Heath Effects; 87 from Series on Analytical Methods; 88 and 89 from Series on Efficacy) were updated for reporting Plant Protection Products. Three OHTs from the Pesticide Residue Chemistry Series (85-4, 85-8, and 85-10) were updated to improve the informational flow of pesticide residue data. One generic Template on “Literature reference” updated, and a set of changes applicable to all OHTs.