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The think-aloud method was introduced in the usability field by Clayton Lewis [3] while he was at IBM, and is explained in Task-Centered User Interface Design: A Practical Introduction by Lewis and John Rieman. [4] The method was developed based on the techniques of protocol analysis by K. Ericsson and H. Simon.
The voiceless alveolar tap or flap is rare as a phoneme. The symbol in the International Phonetic Alphabet that represents this sound is ɾ̥ , a combination of the letter for the voiced alveolar tap/flap and a diacritic indicating voicelessness. The equivalent X-SAMPA symbol is 4_0.
The voiced uvular tap or flap is a type of consonantal sound, used in some spoken languages.There is no dedicated symbol for this sound in the IPA.It can specified by adding a 'short' diacritic to the letter for the uvular plosive, ɢ̆ , but normally it is covered by the unmodified letter for the uvular trill, ʀ , [1] since the two have never been reported to contrast.
Trills may be realized as a single contact, like a tap or flap, but are variable, whereas a tap/flap is limited to a single contact. When a trill is brief and made with a single contact it is sometimes erroneously described as an (allophonic) tap/flap, but a true tap or flap is an active articulation whereas a trill is a passive articulation.
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The Test Anything Protocol (TAP) is a protocol for communicating between test logic, called a TAP producer, and a test harness in a language-agnostic way. Originally developed for unit testing of the Perl interpreter in 1987, producers and parsers are now available for many development platforms.
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The voiced bilabial flap is an uncommon non-rhotic flap. It is usually, and perhaps always, an allophone of the labiodental flap, though it is the preferred allophone in a minority of languages such as Banda and some of its neighbors.