The Director General of the HSE says HIQA's report into Portlaoise Hospital is a watershed report.
Tony O'Brien is appearing before the Oireachtas Health Committee - which earlier heard from bereaved parents, one of whom said she had no faith in current HSE management.
Several babies died at the hospital in recent years, prompting an investigation by the health watchdog.
Mr O'Brien says HIQA's report, which criticised the hospital, and in particular its maternity unit, will fundamentally change how the Health Service operates;