HSE criticised over plan to tackle backlog in assessment of need cases Measures being taken by some HSE areas include the temporary redeployment of personnel from primary care and the Child and Adolescent Mental Health Services As of the end of March, the backlog in AON cases was down to 1,919 cases, but some HSE areas are taking special measures to reduce it further. Mon, 03 May, 2021 - 17:30 Noel Baker, Social Affairs Correspondent The HSE has been criticised over plans to divert primary care psychologists to tackle the backlog in assessment of need (AON) cases, with new figures showing the number of overdue cases now below 2,000.