Too many pupils with special educational needs and disabilities in England lack crucial support, a poll of education staff suggests.
More than 80% of almost 600 staff, who responded to an Association of Teachers and Lecturers poll, said some pupils were being failed.
Ministers should provide "significant and immediate" extra cash, said ATL General Secretary Dr Mary Bousted.
The government said it wanted all children to reach their potential.
Of the 585 staff in English state schools who responded to the poll: