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In page Guild:

"

Where guilds were in control, they shaped labor, production and trade; they had strong controls over instructional capital, and the modern concepts of a lifetime progression of apprentice to craftsman, and then from journeyman eventually to widely recognized master and grandmaster began to emerge. In order to become a master, a journeyman would have to go on a three-year voyage called Wanderjahre.[citation needed] The practice of the Wanderjahre still exists, although it is not obligatory, in Germany and France.