A survey of parent training manuals.

Hamilton et al. (1978) read 26 parent-training manuals. They wrote a chart that lists each manual, how hard it is to read, and any data the manual gives.

The goal was simple. Help clinics pick a manual that parents can follow.

The chart shows big gaps. Some manuals are easy, like a comic book. Others read like a college text. Few give proof that they work.

No new kids were tested. The paper is a map, not an experiment.

Later work keeps the same map idea but adds numbers. Lee et al. (2012) pooled 40 studies and found parent training helps kids with ADHD right away. Sparaci et al. (2015) showed the same small gain for kids with developmental disabilities.

Thompson et al. (1986) looked at the same pool of studies and said, "Most work is sloppy." They asked for better tests and long follow-ups. Hamilton et al. (1978) did not judge quality, so the 1986 paper fills that hole.

Matson et al. (2009) narrowed the lens to developmental disabilities and added 31 years of new papers. The story stayed the same: parent training is useful, but we still need clearer guides.

If you run parent groups, use the 1978 chart as a quick filter. Pick manuals rated "easy" first. Then check later meta-analyses to see which ones have real data behind them. Share the short list with families so they open a book they can actually read.