# Commission Regulation (EU) No 284/2013 of 1 March 2013 setting out the data requirements for plant protection products, in accordance with Regulation (EC) No 1107/2009 of the European Parliament and of the Council concerning the placing of plant protection products on the market (Text with EEA relevance), Division 1.4: When models are used for estimation of predicted environmental concentrations they shall:

Extent: E+W+S+N.I.

make a best-possible estimation of all relevant processes involved taking into account realistic parameters and assumptions,
where possible be reliably validated with measurements carried out under circumstances relevant for the use of the model,
be relevant to the conditions in the area of use.

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Source: https://www.legislation.gov.uk/eur/2013/284/annex/section/9/division/1/division/1.4 (the official version)
Page: https://openlegislation.uk/eu-regulation-2013-284/annex/section-9/division-1/division-1.4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.