USA Pre-K Education: Within the educational arena, there have been numerous research studies in which validated Pre-K educational successful outcome has been significantly proven - primarily within the social & academic language preparedness - ergo, showing nursery schooling as a primary success step before K level.

FYI: the one governmental subsidized programming "Head Start" shows a statistical success level after the first few educational years; however, after the fourth educational schooling year it levels off.

Language education research has also validated the solidity re: a full-day, full year K programming, which by now has been addressed within the USA educational system - the summertime educational R&R for our USA students was based upon long time ago agricultural/farming family needs.