Many assessments exist for investigating children's language. Here is a selection of commonly used assessments by speech and language therapy services in the UK:
TROG - understanding of language
PVCS - preverbal communication checklist
Derbyshire picture test - simple understanding
CELF-4 - a battery of expressive and receptive language tests
CELF-PS - as above, for Pre-School aged children
ACE 6-11 - a battery of receptive, expressive and pragmatic language tests
RAPT - picture naming and grammar/content analysis
BPVS - a receptive assessment of vocabulary
RWFVS - Picture naming/vocabulary test
STASS - expressive grammar
The Bus Story Test - early narrative assessment
CLEAR - phonology screening assessment
STAP - expressive phonology
DEAP - expressive phonology
Peabody Picture Vocabulary Test
Language for Thinking assessment - inferential thinking and understanding
For adults
PALPA - Psycholinguistic Assessment of Language Processing in Aphasia