Language Aptitude as Assessed by the DLAB
The DLAB (Defense Language Aptitude Battery) measures trainability, not vocabulary. Nothing on it comes from a real foreign language: you are dropped into a fictional language with its own sound system and grammar, and each item asks you to notice a pattern and use it immediately. Two abilities carry nearly all the points - phonemic discrimination in the listening parts and rule inference in the written parts.
How the test is built
- Listening items: you hear syllables, words, or short sentences in the invented language and choose the matching or pattern-consistent option. The contrasts that matter are ones English ignores: vowel length, tone or pitch contour, stress position, aspiration, final consonants.
- Written items: a small corpus of phrases arrives with English glosses. You extract word order, affixes (plural, tense, case, negation), and agreement, then translate a sentence you have not seen.
- Format: roughly 126 multiple-choice questions in about two hours, in separately timed parts you generally cannot revisit. A blank scores the same as a wrong answer, so guess rather than leave gaps.
- Scores are reported on a scale where 85 is the commonly cited minimum for entry into Defense Language Institute training; the hardest language categories carry higher cutoffs, so confirm your service's current number.
Core rules
- Every example is evidence. The right option must be forced by the corpus, not by what sounds natural in English.
- Find the minimal pair - the two items differing by exactly one element - and read what changed in the gloss. That difference is the rule.
- Assume non-English defaults until data says otherwise: object before verb, adjective after noun, postpositions, case suffixes, question particles, no articles.
- Affixes occupy fixed slots and can stack; one meaning may appear as a prefix on one stem and a suffix on another.
Worked example
Given: savo mir = the large house; savo mir en = the large houses; mir savo = the house is large; mir savo do = the house is not large. Target: "the houses are not large." Reasoning: -en marks plural on the noun, so the subject becomes mir en. Order flips when the adjective is a predicate rather than a modifier (mir savo, not savo mir). Negation is a clause-final particle do. Combining all three: mir en savo do.
Traps
- Importing English order into a language that reverses it.
- Building a rule from a single sentence; demand two or three data points before committing.
- Treating a pitch or length contrast as noise when it is the whole answer.
- Forgetting the plural suffix sits between the noun and its predicate adjective.