The states that are heading down this road are going to do competitive procurements to choose which providers are going to be chosen. There are in the United States several providers in this space that have had very rigorous evaluations of their programs. The most famous one is called Nurse-Family Partnership, which has had I think three randomized controlled trials of their studies, but there are some others out there that maybe you could have your staff follow up with me on. I can send you an email and give you some more details on that.
On the preschool, the year before entering school type of interventions, those tend to be very state or city specific. There are some models out there but I don't they have brand names in quite the same way the very early childhood ones do.