It is used in 25 countries, has been translated into 17 languages and ranked by the United Nations as the world's leading parenting program.
But a stoush has broken out over whether the ''Triple P'' - Positive Parenting Program - works as well as claimed, and has led to questions about the public money spent on it.
Triple P is an evidence-based program that aims to help adults understand and manage their child's behaviour to become confident parents. Parents sign up voluntarily, or can be referred to a parent educator by a GP, family counsellor or welfare agency.
Matt Sanders, director of the Parenting and Family Support Centre at the University of Queensland, spent three decades developing the program as it grew into the world's leading parenting resource.
Triple P is the biggest of its kind used in Australia, and the NSW government has spent almost $6.6 million to deliver it to 30,000 families. But a number of recent international studies have raised concerns about the program.
Philip Wilson, of the University of Aberdeen, ''found no convincing evidence that Triple P interventions work across the whole population, or that any benefits are long term''. A separate study, published in the International Journal of Violence and Conflict, found Triple P made little difference to the behaviour of 146 children who took part.
Professor Sanders rejected suggestions the program was unproven and ineffectual. ''The vast majority of studies show positive effects, so for the tiny handful that show no effect, it's usually because the intervention has not been implemented properly,'' he said.