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"Jack of all trades, master of none" is a figure of speech used in reference to a person that is competent with many skills, but spends too much time learning each new skill that he/she can not become an expert in any particular one. The earliest recorded versions of the phrase do not contain the second part. Indeed, they are broadly positive in tone. Such a ''Jack of all trades'' may be a master of integration, as such an individual knows enough from many learned trades and skills to be able to bring his or her disciplines together in a practical manner. This person is a generalist rather than an expert (Specialist). ==Origins== In Elizabethan English the quasi-New Latin term Johannes factotum ("Johnny do-it-all") was sometimes used, with the same negative connotation〔(Sourcetext.com )〕 that "Jack of all trades" sometimes has today. The term was famously used by Robert Greene in his 1592 booklet ''Greene's Groats-Worth of Wit'',〔"There is an upstart crow, beautified with our feathers, that with his tiger's heart wrapped in a player's hide supposes he is as well able to bombast out a blank verse as the best of you: and being an absolute Johannes Factotum, is in his own conceit the only Shake-scene in a country." ''Groatsworth of Wit''; cited from William Shakespeare (ed. Stephen Orgel and A. R. Braunmuller) The Complete Works (Harmondsworth: Penguin, 2002) p. xlvii.〕 in which he dismissively refers to William Shakespeare with this term, the first published mention of the writer. In 1612, the English-language version of the phrase appeared in the book "Essays and Characters of a Prison" by English writer Geffray Mynshul (Minshull) originally published in 1618, and probably based on the author's experience while held at Gray's Inn, London, when imprisoned for debt.〔()〕 Mynshul uses only the first half of the phrase in the book, which may indicate that the phrase was in common usage at the time he wrote his account. Indeed, the 'jack of all trades' part of the phrase was in common use during the 17th century and was generally used as a term of praise. 'Jack' in those days was a generic term for 'man'. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Jack of all trades, master of none」の詳細全文を読む スポンサード リンク
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