This report was produced as a part of the project EASYTRAC, an EU project under the programme Competitive and Sustainable Growth: Contract No. G6RD-CT-2000-00188, coordinated by UNIMETRIK S.A. (Spain). The project is concerned with low uncertainty calibrations on coordinate measuring machines (CMMs). For this project, the Centre for Geometrical Metrology (CGM) at the Technical University of Denmark (DTU) has taken care of freeform measurements, in collaboration with the Dipartimento di Innovazione Meccanica e Gestionale (DIMEG) - University of Padova - Italy. The present report describes feasibility and experimental results of calibrations of freeform parts on CMMs as contribution to development of the ISO 15530 series of standards currently under consideration by the ISO TC 213/WG10.