Welcome to my statistical dojo Simon-san.A word of caution, 6 Sigma and SPC is very broad so when choosing a subject matter to complete the various stages....be wary of what you want to achieve with it (i.e. focus on manufacture, procurement etc. from the start)Try and find out what companies have a specific focus on 6 Sigma as you'll generally find a bias in American firms and companies over European companies.Six-Sigma is really a set of tools that have been evolved and repackaged, applied to problems that would not traditionally be addressed using stat analysis.I'm going through my Six Sigma master black-belt having done green and black (and associated projects that are required at certification) and find it pretty challenging to use the full discipline.