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In science and engineering, root cause analysis (RCA) is a method of problem solving used for identifying the root causes of faults or problems. [1] It is widely used in IT operations, manufacturing, telecommunications, industrial process control, accident analysis (e.g., in aviation, [2] rail transport, or nuclear plants), medical diagnosis, the healthcare industry (e.g., for epidemiology ...
The English interrogative words (also known as "wh words" or "wh forms") are words in English with a central role in forming interrogative phrases and clauses and in asking questions. The main members associated with open-ended questions are how, what, when, where, which, who, whom, whose, and why, all of which also have -ever forms (e.g ...
In English, most of the interrogative words begin with the same letters, wh-; in Latin, most also begin with the same letters, qu-. This is not a coincidence, as they are cognates derived from the Proto-Indo-European interrogative pronoun root k w o-, reflected in Proto-Germanic as χ w a-or kh w a-and in Latin as qu-. [citation needed]
An interrogative word or question word is a function word used to ask a question, such as what, which, when, where, who, whom, whose, why, whether and how. They are sometimes called wh-words , because in English most of them start with wh- (compare Five Ws ).
The artificial depth of the fifth why is unlikely to correlate with the root cause. The five whys is based on a misguided reuse of a strategy to understand why new features should be added to products, not a root cause analysis. To avoid these issues, Card suggested instead using other root cause analysis tools such as fishbone or lovebug diagrams.
When more than one variant spelling exists within a national variety of English, the most commonly used current variant should usually be preferred, except where the less common spelling has a specific usage in a specialized context, e.g., connexion in Methodist connexionalism.
Boldface is often applied to the first occurrence of the article's title word or phrase in the lead.This is also done at the first occurrence of a term (commonly a synonym in the lead) that redirects to the article or one of its subsections, whether the term appears in the lead or not (see § Other uses, below).
In languages with wh-movement, sentences or clauses with a wh-word show a non-canonical word order that places the wh-word (or phrase containing the wh-word) at or near the front of the sentence or clause ("Who are you thinking about?") instead of the canonical position later in the sentence ("I am thinking about you").