Bertram Schaefer is founder and principal of STATCON (Statistical Consulting) in Witzenhausen, Germany. He has 25 years of statistical consulting experience in different subjects, i.e. Quality Control and R&D. He has a Masters degree in social science from the university of Göttingen and worked as responsible university lecturer for statistics in the agricultural department of the University of Kassel for many years. He still is instructor and author for all statistics related subjects within the German society of Quality (DGQ). His main focus in STATCON is on Design of Exeriments, Statistical Quality Control, six sigma as well as Market Research and Econometrics.