Abstract:First of all, I would like to thank my supervisor, Prof. Dr. Ursula Renold, for the opportunity to write this thesis under her supervision, for her advice, support and constructive feedback. Thank you for always being motivating, and for conveying your passion and enthusiasm for vocational education and training. I would also like to thank Prof. Dr. Stefan C. Wolter for acting as co-examiner and for all valuable comments received on the final version of the thesis, but also at earlier stages.I am deeply indebt… Show more
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