A serious case review into the death of four-year-old Daniel Pelka found repeated failures by agencies set up to safeguard children's welfare but concluded nobody could have predicted his death at the hands of an abusive mother her partner.
Prof Eileen Munro told ITV News the Serious Case Review into Daniel Pelka's death is "very frustrating".
Prof Munro, who conducted a review into high-profile abuse cases including the death of Baby P, said the new report "tells you what happened, but it gives you very little idea of why".
She continued: "These were clearly professionals who were concerned about Daniel, they were very actively trying to help him and they failed.
"And I don't get a sense from the review of why they failed - what it looked like, how they were misled, why they didn't see the sadistic torture that was going on - so I find I cannot clearly see what lessons you can draw from it."
Opportunities to protect Daniel Pelka, who was beaten to death by his mother and stepfather, 'were missed' a serious case has revealed.
Daniel Pelka's Serious Case Review is strong on what went wrong, but weak on explaining why it was allowed to happen.