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Programming is a craft that can be efficiently learned from people who already master it. Our previous work introduced a teaching method we call Extreme Apprenticeship (XA), an extension to the cognitive apprenticeship model. XA is based on a set of values that emphasize doing and best programming practices, together with continuous feedback between the master and the apprentice. Most importantly, XA is individual instruction that can be applied even in large courses. Our initial experiments (n = 67 and 44) resulted in a significant increase in student achievement level compared to previous courses. In this paper, we reinforce the validity of XA by larger samples (n = 192 and 147) and a different lecturer. The results were similarly successful and show that the application of XA can easily suffer if the core values are not fully adhered to.