TESOL

Teaching English to Speakers of Other Languages", used in English Language Learning and Teaching.
ESL (English as a second language), ESOL (English for speakers of other languages) and EFL (English as a foreign language) all refer to the use or study of English by speakers of other languages. The precise usage, including the different use of the terms ESL and ESOL in different countries, is described below. These terms are most commonly used in relation to teaching and learning English, but they may also be used in relation to demographic information.

The many acronyms used in the field of English teaching and learning may be confusing. English is a language with great reach and influence; it is taught all over the world under many different circumstances. In English-speaking countries, English language teaching has essentially evolved in two broad directions: instruction for people who intend to stay in the country and those who don't. These divisions have grown firmer as the instructors of these two "industries" have used different terminology, followed distinct training qualifications, formed separate professional associations, and so on. Crucially, these two arms have very different funding structures, public in the former and private in the latter, and to some extent this influences the way schools are established and classes are held. Matters are further complicated by the fact that the United States and the United Kingdom, both major engines of the language, describe these categories in different terms: as many eloquent users of the language have observed, "England and America are two countries divided by a common language." (Attributed to Winston Churchill, George Bernard Shaw, and Oscar Wilde.) The following technical definitions may therefore have their currency contested.

Difficulties for learners

Language teaching practice often assumes that most of the difficulties that learners face in the study of English are a consequence of the degree to which their native language differs from English (a contrastive analysis approach). A native speaker of Chinese, for example, may face many more difficulties than a native speaker of German, because German is closely related to English, whereas Chinese is not. This may be true for anyone of any mother tongue (also called first language, normally abbreviated L1) setting out to learn any other language (called a target language, second language or L2). See also second language acquisition (SLA) for mixed evidence from linguistic research.

Language learners often produce errors of syntax and pronunciation thought to result from the influence of their L1, such as mapping its grammatical patterns inappropriately onto the L2, pronouncing certain sounds incorrectly or with difficulty, and confusing items of vocabulary known as false friends. This is known as L1 transfer or "language interference". However, these transfer effects are typically stronger for beginners' language production, and SLA research has highlighted many errors which cannot be attributed to the L1, as they are attested in learners of many language backgrounds (for example, failure to apply 3rd person present singular -s to verbs, as in 'he make').

While English is no more complex than other languages, it has several features which may create difficulties for learners. Conversely, because such a large number of people are studying it, products have been developed to help them do so, such as the monolingual learner's dictionary, which is written with a restricted defining vocabulary.