"We had a huge number of whanau violence cases and we were thinking how can we help?" she said.
"[Former Rotorua policeman] Wally Haumaha and I met up with kaumatua here and in Raukawa and Tuwharetoa to look at alternative ways within tribal areas in dealing with it. We then approached the local judges and said because of the high numbers in Rotorua we need to be allowed to try some of these alternatives and see what difference it would make otherwise you would keep having recidivist offenders," she said.
"It never stopped from there, the judges went with it, they had faith it could work and they became the frontrunners for the country.
Mrs Rennie said she was thrilled to be part of the book.
"I think this book is amazing, I never dreamed it would happen. "
Judge McGuire said without a doubt he was seeing the benefits of the process.
"You see males for the first time, understanding their role to be a provider and protect and not an abuser," he said.
"I think it's marvellous the book is being launched here, we have gotten over the cringe factor and actually recognise we have a family violence problem and are facing it head on.
"What we are doing now is being seen by not only the country but the rest of the world."
A Restorative Approach to Family Violence: Changing Tack is being launched in Rotorua on July 3 at the Rotorua District Council Chambers.