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A master craftsman or master tradesman (sometimes called only master or grandmaster) was a member of a "guild. In the European "guild system, only masters and journeymen were allowed to be members of the guild.
An aspiring master would have to pass through the career chain from "apprentice to "journeyman before he could be elected to become a master craftsman. He would then have to produce a sum of money and a "masterpiece before he could actually join the guild. If the masterpiece was not accepted by the masters, he was not allowed to join the guild, possibly remaining a journeyman for the rest of his life.
Originally, holders of the academic degree of ""Master of Arts" were also considered, in the Medieval universities, as master craftsmen in their own academic field.
This tradition originates in Medieval Europe. The earliest guilds were "frith" or "peace" guilds - groups bonded together for mutual protection following the breakdown of the kins, which were groups related by blood ties.
Merchant guilds - associations of international trades - were powerful in the twelfth and thirteenth centuries, but lost their ascendancy with the rise of the "craft guilds - associations of master craftsmen, journeymen, apprentices and the various trades connected with a particular craft.
The world-renowned "College of Arms in London awarded the coat of arms of The Guild of Master Craftsmen in 1992, after four years of assessment. Designed by heraldic expert Peter Greenhill to reflect the many categories of Guild membership, it features: three escutcheons (shields) to represent "artists, "painters and stainers; a pair of compasses opened in chevron for "building, "construction and "carpenters; a "dovetail (separating the top third of the shield from the rest) to represent "cabinetmaking, "woodworking and "joinery; and a "gavel and "chisel for "masons and stoneworkers. The southern keep of "Lewes Castle, which overlooks the Guild’s headquarters, is featured above the helmet as the crest.
While, for the most part, guilds as such do not exist, many trades continue the apprentice-journeyman-master model. "Carpenters, "electricians, "pipefitters and "plumbers are notable examples. There is also the United States Bartenders Guild, which, through a series of tests, grants bartenders the title of Master Mixologist. Even in "academia, the tradition survives, with elementary, middle and high school completing general education; with post secondary degrees awarded in the Associates, Bachelor and Master levels; and "PhD students as apprentices, "post-docs and associate professors as journeymen and full "professors as masters.   
The doctoral thesis which needs to be presented in order to get an academic degree, proving the student's proficiency in the chosen subject and whose quality is examined by existing lecturers, is in effect a form of the medieval "masterpiece which needed to be prepared by anyone seeking to be accepted as a master in any professional guild.
The terms "Master Mariner and "harbormaster reflect the fact that the holders of such positions were originally Master craftsman in the Seamen's Guild. Further derived from "harbormaster" is ""stationmaster", though guilds no longer existed when railways came into being.
In Germany, the master craftsman (Meister) is the highest professional qualification in crafts and is a state-approved grade. The certification is called Meisterbrief. The qualification includes theoretical and practical training in the craft as well as business and legal training. Additionally, it implies the qualification to train apprentices. These qualifications prepare the Meister for running their own business or alternatively for higher positions at a company. The status of master craftsmen is regulated in the German Gesetz zur Ordnung des Handwerks ("Crafts and Trades Regulation Code).
While privileged guilds have been abolished in Germany, the ranks of apprentice (Lehrling), journeyman (Geselle) and master craftsman have been retained even through modern times. For security-relevant crafts, e.g., "electricians and "chimney sweeps, any business in the trade has to be run by a master craftsman or has to employ at least one Meister.
Journeymen and master craftsmen are by law automatically members of their regional chamber of crafts (Handwerkskammer), which is a self-governing public body. The chamber organizes vocational training and oversees the examination of the journeymen and masters.
To become a master craftsman, it is usually required to have completed vocational training in the craft in which the examination should be taken, which finishes with a final examination called Gesellenprüfung (journeyman's examination), and to have practical experience of at least 3 to 5 years as a journeyman (Geselle). If these requirements are fulfilled, the candidate can take courses for the Meisterprüfung (master craftman's examination). The duration of the courses takes 4 to 6 years depending on the craft. The examination includes theoretical, practical and oral parts and takes 5 to 7 days (depending on the craft). In some crafts, the creation of a "masterpiece is also part of the examination.
The German Meister qualifies the holder to study for a bachelor's degree at "University, whether the Meister holds a regular "university entrance qualification or not. According to the German "Qualifications Framework, the Meisterbrief is at the same level as a bachelor's degree, even though it is not an academic degree and thus not directly comparable.