The majority of early-intervention programs in the 1960s that were designed to enhance the intellectual development of poor children: were…
The preponderance of early-intervention programs in the 1960s that were calculated to improve the psychological product of inconsiderable children:
were prudent, large-scale programs.
initially increased children's IQ scores substantially.
were undignified in preventing assignment to special-education classes and decreasing the air of entity held tail a year in ground.
had long-term effects on IQ scores.