What were the key results of the Perry Preschool, Abecedarian Project, and Chicago Child-Parent Centers research studies?

The paper should be 1-2 pages, double-spaced and include at least 2 credible sources. The paper should follow APA formatting for the citations of your sources.

What were the key results of the Perry Preschool, Abecedarian Project, and Chicago Child-Parent Centers research studies?