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Description: A number of different language measures are used in child language acquisition studies. This raises the issue of comparability across tasks, and whether this comparability diverges depending on the specific language domain, or the language population, (e.g., monolinguals versus bilinguals). The current study investigates the compara-bility across tasks in the domains of vocabulary, morphology and syntax, in sequential bilingual (N=40, Arabic L1) and monolingual (N=40) primary school-aged children (5;3-12;6, mean=8;5). We collected narrated speech samples to produce measures across language domains, and additional measures from separate vocabulary, morphology and syntax assessments. Using a logistic regression analysis, we find a correspondence between syntax measures in monolinguals; however, no further correspondences emerge in the other domains, or at all in bilinguals. This suggests that assessment measures are highly task-dependent, and that a given assessment measure is not necessarily indicative of language as a whole, or even of language within a language domain. We also find selective effects of age for monolinguals and both age and length of exposure (LOE) for bilinguals; in particular, while LOE predicts variation between the first and second language, age effects reflect underlying similarity across languages. We consider the implications of these effects for language assessments across populations.