So much of what we know about the effects of early childhood education is based on research conducted in North America where we have been fortunate enough to have studies like those conducted on the Perry Preschool Program. Of course, repeating the Perry study 40 years later would be difficult if not impossible here in the U.S. That’s because over the decades out-of-home child care and preschool have become so prevalent that any large sample of children against which researchers compare the early education treatment is far less likely to have attended no type of early childhood program. This complicates matters when measuring the true effects of access to quality preschool since it is difficult to gauge to what extent the “impure” control group affects the outcome.
Please visit National Institute for Early Education Research (NIEER) for the complete blog post.