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G. Phillips, G. Free, I. Karottki, C. Laplace-treyture, K. Maileht et al., Jeroen Van Wichelen Edited by Sandra Poikane Luxembourg: Publications Office of the European Union carry out a European intercalibration (IC) exercise. The aim of the Intercalibration is to ensure that the values assigned by each Member State to the good ecological class boundaries are consistent with the Directive's generic description of these boundaries and comparable to the boundaries proposed by other MS, Water Framework Directive Intercalibration Technical Report: Central Baltic Lake Phytoplankton ecological assessment methods Authors, vol.62, 2008.

, Lake Geographical Intercalibration Groups according to the ecoregion and biological quality element. In this report we describe how the intercalibration exercise has been carried out in the Central Baltic Lake Phytoplankton IC group