Predictive text

Predictive text is an <a href="/facts/Input_technology/HoB832tg">input technology</a> used where one key or button represents many letters, such as on the physical <a href="/facts/Telephone_keypad/lJWSa85A">numeric keypads</a> of <a href="/facts/Mobile_phone/H3EcqD9h">mobile phones</a> and in <a href="/facts/Accessibility/hp9gz5GK">accessibility</a> technologies. Each key press results in a prediction rather than repeatedly sequencing through the same group of "letters" it represents, in the same, invariable order. Predictive text could allow for an entire word to be input by single keypress. Predictive text makes efficient use of fewer device keys to input <a href="/facts/Writing/ke1HYEU8">writing</a> into a <a href="/facts/SMS/kacRfW0X">text message</a>, an <a href="/facts/E-mail/6pD9GLtI">e-mail</a>, an <a href="/facts/Address_book/JdYNCHD7">address book</a>, a <a href="/facts/Calendar/mgY3sm8P">calendar</a>, and the like.
The most widely used, general, predictive text systems are <a href="/facts/T9_(predictive_text)/uMVDYxys">T9</a>, <a href="/facts/ITap/MHY7CHS3">iTap</a>, <a href="/facts/Zi_Corporation/Ivzj83MV">eZiText</a>, and <a href="/facts/LetterWise/Mex1uWMe">LetterWise</a>/WordWise. There are many ways to build a device that predicts text, but all predictive text systems have initial linguistic settings that offer predictions that are re-prioritized to adapt to each user. This <a href="/facts/Machine_learning/e0w0XJTu">learning</a> adapts, by way of the device memory, to a user's disambiguating feedback that results in corrective key presses, such as pressing a "next" key to get to the intention. Most predictive text systems have a user database to facilitate this process.
Theoretically the number of keystrokes required per desired character in the finished writing is, on average, comparable to using a <a href="/facts/Keyboard_(computing)/MczF9LIS">keyboard</a>. This is approximately true providing that all words used are in its database, punctuation is ignored, and no input mistakes are made typing or spelling. The theoretical keystrokes per character, KSPC, of a keyboard is KSPC=1.00, and of multi-tap is KSPC=2.03. Eatoni's <a href="/facts/LetterWise/Mex1uWMe">LetterWise</a> is a predictive multi-tap hybrid, which when operating on a standard telephone keypad achieves KSPC=1.15 for English.
The choice of which predictive text system is the best to use involves matching the user's <a href="/facts/ITap/MHY7CHS3">preferred interface style</a>, the user's level of learned ability to operate predictive text software, and the user's efficiency goal. There are various levels of risk in predictive text systems, versus <a href="/facts/Multi-tap/lBR0mtV7">multi-tap</a> systems, because the predicted text that is automatically written that provide the speed and mechanical efficiency benefit, could, if the user is not careful to review, result in transmitting misinformation. Predictive text systems take time to learn to use well, and so generally, a device's system has user options to set up the choice of multi-tap or of any one of several schools of predictive text methods.

Predictive text open-in-new

Predictive text