A performance audit has found ACT child protection authorities do not know the whereabouts of some of the children in their care.
A report released today by the ACT Auditor-General shows in November 2012 there were 573 children and young people in the care of authorities.
But the Community Services Directorate could not say where all of the children were, even during school hours, because information on the database had not been updated.
The report also found some children in foster care may never be visited by staff.
The audit shows the Community Services Directorate has recruited extra caseworkers to deal with staff shortages, but says the directorate's ability to provide "adequate and immediate support" is at risk.
"I'm pleased the Auditor-General found that the care and protection workforce was more stable and better resourced than it has been for a long time," she said.
Ms Burch says the recommendations are in line with changes which are already underway.
"The ACT Government has embarked on changes to the care and protection system following the Public Advocate's report last year," she said.
"The findings of the Auditor-General's report show these reforms are focusing on the right areas.
"The report also raises a number of new issues which the Government will work through.
"The Government has agreed or agreed in principle to all the recommendations in the report, which will inform the reform package currently underway."
But Opposition Leader Jeremy Hanson says the Government needs to do more.
"It's actually frightening that children and young people, some of the most vulnerable people in our society, the Government doesn't even know where they are," he said.
"It seems that many of the problems the Government has been promising to fix they simply haven't."
Mr Hanson says he wants to know if the system is capable of being upgraded.
"They need to say whether the system is actually a viable system for doing what it needs to do," he said.
The Government plans to implement requirements that all children be visited at least once a year by protection staff and that record keeping be more frequent and better maintained.