With the industrial revolution and the explosion in childhood education, standardized tests emerged as a way of assessing large groups of children quickly. (thoughtco.com)
So large groups of children and families offer challenges. (kidsmatter.edu.au)
In this science talk, Nathan A. Fox talks about the limitations of traditional early childhood intervention studies, which examine the effects of programs on large groups of children with the hope that one size fits all. (developingchild.harvard.edu)