The largest general education study conducted in the US is known as "Project Follow-Through." Project Follow-Through is the most responsive effort ever designed to find out what works well and how to serve at-risk children effectively. At-risk students such as the students from Head Start programs that have a economically disadvantage were involved in Project Follow-Through too. But, because budget cuts, the focus of this project changed to one of identifying effective approaches/programs for teaching this population of the students. In total there was twelve programs that were examined.
The programs of Project Follow-Through were categorized as:
1.) basic skills model
2.) cognitive-conceptual model
3.) affective-cognitive model