Criterion
Rare-language production history: actual delivery, not a website list
What you gain: Evidence that the vendor has sourced, delivered, and quality-checked production work in genuinely rare languages, beyond claimed coverage.
Listing 300 or 500 languages is easy. Delivering production-grade translation in Bhojpuri, Maithili, or Kinyarwanda requires linguists who have completed real projects, project managers who understand the sourcing constraints, and QA processes adapted for low-resource pairs. Ask for specific languages, specific volumes, and specific timelines from recent engagements.
Ask: "For [your target rare language], how many projects have you delivered in the past 12 months? What was the volume, and can you share a redacted QA report from one of those projects?"
Criterion
Who actually sources the rare-language reviewer?
Where do your linguists actually come from? The answer determines your quality ceiling, continuity risk, and ethical standing - and for rare languages, it matters more than the linguist count.
Three models exist:
Ask: "For our target language, do you recruit linguists directly or subcontract? How long has your sourcing relationship with this language community been active?"
Criterion
Script and orthography expertise
Languages with non-Latin scripts, multiple orthographies, or no standardized written form require specialized expertise from the vendor.
Many rare languages use scripts that standard translation tools do not fully support. Some languages have competing orthographies (different communities writing the same language differently). Others are primarily oral, with recently developed writing systems that linguists may render inconsistently. A vendor handling these languages needs:
Ask: "Does our target language have a standardized orthography? If not, what convention will you follow, and how do you ensure consistency across linguists?"
Criterion
Quality methodology for low-resource languages
Do this: Ask specifically how QA changes when automated tools do not exist. Avoid this: Accepting "we have a robust QA process" as a complete answer for a language with no spell-checker.
Standard QA relies on spell-checkers, grammar tools, and terminology databases. For rare languages, most of these tools do not exist. A credible quality methodology for low-resource pairs includes:
Ask: "How does your QA process change for languages where automated quality tools do not exist? What is your review sampling rate for rare vs. high-resource languages?"
Criterion
Cultural consultation capability
The risk: Culturally inappropriate translations that are linguistically correct but contextually wrong.
Rare-language communities often have cultural sensitivities that mainstream localization workflows miss entirely. Religious terminology, kinship terms, honorifics, and taboo words vary not just by language but by dialect and community. A vendor handling rare languages should be able to:
Ask: "Can you provide a cultural consultant for our target language? How do you handle content that is linguistically translatable but culturally sensitive?"
Criterion
Scalability for rare-language pairs
Scaling rare languages is fundamentally different from scaling French or Mandarin, and the capacity limits are real, not negotiable. Building your project plan on optimistic estimates rather than actual throughput ceilings is how timelines collapse.
The talent pool has a hard ceiling. A vendor who can deliver 5,000 words per day in Santali may not be able to deliver 50,000. Understanding the vendor's capacity limits before you commit prevents mid-project surprises. Key questions:
Ask: "What is your maximum sustained throughput for [target language]? How many backup linguists do you maintain, and what is your replacement SLA if a primary linguist drops out?"
Criterion
Ethical sourcing and community engagement
What you gain: Reduced reputational risk and sustainable access to linguist communities that will continue working with the vendor long-term.
Rare-language work involves small communities. How the vendor treats those communities determines both ethical standing and practical sustainability. An ethical sourcing framework should include:
Ask: "How do you determine compensation rates for rare-language linguists? Do contributors receive transparency on how their work will be used?"
Criterion
Security and compliance posture
What you gain: Assurance that sensitive content handled by rare-language linguists receives the same security controls as mainstream language work.
Rare-language projects sometimes involve sensitive domains: medical content for underserved populations, legal documents for indigenous rights cases, or AI training data under NDA. The vendor's security posture must not degrade for rare languages just because the linguist pool is smaller and harder to govern. Look for:
Ask: "Do your rare-language linguists sign individual NDAs? How do you enforce data access controls when linguists work remotely from regions with limited IT infrastructure?"
Criterion
Workflow structure: batches or ongoing coverage
The bottom line: Rare-language delivery is rarely continuous, and promising otherwise is a sign the vendor has not done this before.
Linguist availability may be part-time or seasonal. A vendor who promises daily delivery in a language with three available linguists is either overpromising or planning to use unvetted resources. Realistic delivery models for rare languages:
Ask: "What delivery cadence do you recommend for [target language]? How does linguist availability affect your turnaround commitments?"
Criterion
Technology and tool support
Understanding whether the vendor's technology stack actually supports your rare language or will create friction in production.
CAT tools, translation memories, and terminology databases are built for high-resource languages. For rare languages, check whether the vendor's tools can handle:
Ask: "Which CAT tools do your linguists use for [target language]? If the tool does not support the script natively, what is the fallback workflow, and how does that affect QA?"
Criterion
Pricing transparency for rare-language work
Rare languages cost more. That is not a negotiation tactic; it reflects smaller linguist pools, longer sourcing cycles, and higher QA overhead. A transparent vendor explains why the rate is what it is. An opaque vendor quotes a high number without context. What to evaluate:
Be cautious of vendors who quote rare-language rates identical to their high-resource rates. Either they are cross-subsidizing (which means they will cut corners elsewhere) or they do not actually have rare-language capacity and will subcontract at a markup.
Ask: "What drives the rate differential between your high-resource and rare-language pairs? Does the quoted rate include full QA, or is review billed separately?"