The participation of the following people in this round robin is appreciated: Rainer Schmidt, Bruker AXS; Juan Charquero, Cemex; Christian Schneider, Verein Deutscher Zementwerke e.V.; Marcus Paul, Dyckerhoff AG; Juiliett Muller, Thermo-ARL; Miguel Angel Garcia Aranda and M. Ángeles Gómez de la Torre, Universidad de Málaga; Steven Feldman, PANalytical; Thomas Fuellmann and Karen Scrivener, Laboratory of Construction Materials, Ecole Polytechnique Federale de Lausanne; Francesc Guirado i Gispert, Universitat Rovira i Virgili; Niels Lundgaard and Kirsten Theisen, F.L. Smidth Research Laboratory; and Stefan Leigh of the Statistical Engineering Division at the National Institute of Standards and Technology.