ABSTRACT
In the mid-1980s, Sally Grantham-McGregor pioneered a home visiting intervention aimed at improving child development outcomes in Jamaica. The Jamaica project was an efficacy trial, highly controlled and rigorously studied, and it was found to have significant positive impacts on children who participated in the program. The pilot program in Colombia built from the lessons learned in Jamaica and sought to implement the model in a manner that could be replicated at scale, relying on existing infrastructure and community resources, and with low-intensity supervision. Like in Jamaica, it was implemented in the context of a research project. Peru, on the other hand, was an at-scale implementation of the model in real-world conditions, under the leadership of a government and with a very rapid expansion in coverage. More notably, the number of participants involved in the three programs differed dramatically, which resulted in differences in implementation.
