Four recent volumes on acquisition of French by different populations cover a range of areas, particularly the development of verbal tense/agreement and nominal gender/concord in first language (L1) acquirers, as opposed to second language (L2) learners; the generalizability of grammatical deficits (e.g. difficulty acquiring parametrized features different from the L1); and variation in acquisition between functional features from different domains: nominal and verbal, for example, are not all acquired at a comparable rate or with analogous errors across different learning populations. The detailed data on acquisition of French presented in these studies furnishes strong evidence for Universal Grammar (UG) systematicity that is not at all predictable from input frequency alone.