Assault evidence limited, Tas inquiry told

Evidence gathered about a child-on-child assault is limited, a Tasmanian inquiry has been told. (AAP)

A former Tasmanian government worker has told a sexual abuse inquiry limited evidence was gathered about an "obvious" serious child-on-child assault in the state's out-of-home care system.

A commission of inquiry into Tasmanian government responses to child sexual abuse in public institutions is this week examining out-of-home care.