How Local Language Coach courses are researched

Local Language Coach builds regional language courses from documented sources and explicit editorial rules. Research can support spelling, grammar, register, regional vocabulary, and the words used by real services. It cannot prove that one phrase, voice, or course represents every speaker in a country or province.

We describe the courses as research-based. We do not describe them as native-written, native-reviewed, expert-verified, human-recorded, or a guarantee of fluency.

Course creation and review are machine-assisted. Two independent machine-review methods inspect frozen course files against cited sources and block release when they find an unresolved issue. No native speaker, professional linguist, or human language reviewer has verified these courses. Machine review can identify contradictions and enforce evidence requirements, but it cannot make an unsupported phrase reliable; a finding remains blocked until the wording is corrected from authoritative evidence and reviewed again.

Regional scope

The current shipping course baselines are:

• broadly Peninsular Spanish for Spain
• a Mexico City-centered baseline for Mexico
• a conservative service baseline with documented usted and vos distinctions for Costa Rica

Planned courses are not represented as available. Their working research scopes, subject to change before release, are:

• a Buenos Aires and Rioplatense baseline for Argentina
• a Bogotá-centered baseline for Colombia
• a broadly understood, São Paulo-centered Brazilian Portuguese baseline
• a France French baseline with Paris service terminology where a city-specific example is needed
• a Québec French baseline with Montréal service terminology where a city-specific example is needed
• modern standard Italian with local or regional forms labeled when used

These labels narrow the teaching target. They do not make the baseline universal within the named region.

Source hierarchy

We use sources in this order:

1. Language authorities and primary linguistic research for spelling, grammar, morphology, register, and attested regional distribution.
2. Region-specific dictionaries, corpora, and language institutions for local meaning and usage scope.
3. Current first-party sources, such as transport operators, airports, central banks, public agencies, and official tourism bodies, for the words learners encounter in a specific task.
4. Diagnostic tools, including translation systems and language models, only to discover possible issues. They cannot approve a phrase.

Examples of core references include:

• Spanish: RAE and ASALE Diccionario de la lengua española, Diccionario panhispánico de dudas, Diccionario de americanismos, and CORPES XXI
• Mexico: Diccionario del español de México
• Costa Rica: Universidad de Costa Rica, Español de Costa Rica
• Argentina: Academia Argentina de Letras, Diccionario de la lengua de la Argentina
• Colombia: Instituto Caro y Cuervo, Diccionario de colombianismos
• Brazilian Portuguese: Academia Brasileira de Letras, Vocabulário Ortográfico da Língua Portuguesa and Projeto Atlas Linguístico do Brasil
• France French: Dictionnaire de l’Académie française and FranceTerme
• Québec French: Office québécois de la langue française, Vitrine linguistique
• Italian: Accademia della Crusca language consulting, Treccani Vocabolario, and Treccani Enciclopedia dell’Italiano

Phrase-level validation

Every releasable phrase must have a clear English intent, setting, speaker relationship, register, regional scope, complete target form, accepted variants, source record, and matching audio script.

We check:

• meaning and translation in context
• grammar, spelling, accents, and agreement
• formal, familiar, plural, and relationship-sensitive forms
• regional fit without treating one city or community as an entire country
• current operational terminology for money, transport, airports, food, and public services
• distractors and accepted answers, so a correct regional variant is not marked wrong
• audio presence, decoding, and script match
• safety-critical, medical, emergency, and money-related language with a higher evidence threshold

A phrase is withheld when reliable sources conflict and the conflict cannot be explained by region, register, relationship, or context.

Known limits

Language changes, and regional usage varies. A dictionary entry proves that a form is recorded, not that it is the best line in every conversation. A city transport term does not automatically apply nationwide. A synthetic voice provides one pronunciation reference, not the full range of local speech.

For those reasons, courses prefer broadly understood beginner language, label narrow regional forms, and avoid claims that the app will make every learner sound local or become fluent.

Corrections

If you find a language, context, or pronunciation issue, email publishing@bitqueststudio.com. Include the regional edition, lesson number, exact phrase, English intent, and any authoritative source that supports the correction.

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