Describes how various components of Mathematica's complex study fit together and explains perspectives and principles related to 1) distinguishing implemented programs from intended ones, 2) ensuring broad coverage to explore competing theories of effective programming, 3) collecting...

This publication, the first major report on the Early Head Start national evaluation, focuses on early implementation experiences and tells the story of the 17 programs that helped launch the first nationwide program for low-income infants and toddlers.

This publication, the first major report on the Early Head Start national evaluation, focuses on early implementation experiences and tells the story of the 17 programs that helped launch the first nationwide program for low-income infants and toddlers.