In the Australian state of Victoria, they track what actions are taken to save lives.
"I think it's probably the way to go if we're to serve a useful purpose," said Chief Coroner Neil MacLean, "but it does raise some huge resourcing issues."
About 250 deaths come before New Zealand's 15 coroners each year, but an inquest can be launched only after every other investigation, such as a police inquiry, is finished. It can sometimes take years to reach the inquest stage.
Courts Minister Chester Borrows said a number of recommendations had received public attention and resulted in changes to policies or infrastructure.
But he admitted the interaction between coroners and other agencies could be improved.
A Herald on Sunday investigation into five years of road deaths found 34 coronial recommendations were fully implemented, 13 were partly implemented and 14 disregarded. Eight more recommendations got lost in the system.
Coronial Services of New Zealand has engaged two Otago University academics in a two-year project to evaluate the Coroners Act and the effectiveness of recommendations.
Parents' relief over inquest
Robert and Linda Barlow were not convinced their son, Adam, was stillborn in 2009 so took their medical notes to the coroner.
An inquest was held into Adam's death and this week Coroner Gordon Matenga said the midwife's inexperience was partly to blame.
Robert Barlow said it was hard to listen to details of how his son died, but the 10-day inquiry was "thorough and rigorous".
"To have the Coroner listen to our concerns, it's hard to put it into words how we felt, but you can imagine it was a huge relief."