The new head of children's services in Cornwall has pledged to ensure the safety of children after a report said some were at risk of significant harm.
The Ofsted report identified a lack of "robust risk assessment" which could lead to "drift and delay".
Children's services head Jack Cordrey said he had met social workers and team leaders on cases examined by Ofsted.
He said he was determined to understand "who was responsible for the inadequacy of those cases".
The report is the second critical assessment of the council's services by Ofsted which highlighted problems in 2009.
Although it said there had been improvements in 15 key areas identified by the authority the focus on operational child protection procedures and practices was insufficient.
Responding to the criticism, Mr Cordrey said: "I've met with the social workers and the team managers and we're taking the appropriate action to make sure that the children in those cases are safe."
But he said his aim was "to really understand for those cases that were inadequate why they were inadequate".
The council has pointed out that inspectors did not refer to any cases "where they felt a child was at immediate risk of harm".
Mr Cordrey added that he wanted to send out "a very clear message to everybody that we're going to take action".