Progress and outcomes for children with autism receiving parent-managed intensive interventions.

Bibby et al. (2002) tracked kids with autism whose parents ran the ABA program at home.

They looked at changes in IQ, language, and daily-living skills after one year.

There was no control group, just before-and-after scores.

Kids made only small gains in adaptive skills and no gain in IQ.

None reached the normal range on test scores.

The authors said parent-managed ABA falls short of clinic-based results.

Hayward et al. (2009) ran a similar home program but added weekly expert checks. Their kids gained 16 IQ points and matched clinic gains, a direct contradiction that shows supervision matters.

Rodgers et al. (2021) pooled 491 preschoolers in a meta-analysis. They found small adaptive and medium IQ gains after two years of intensive ABA, placing the 2002 small effects at the low end of a wider range.

Kovshoff et al. (2011) followed children two years after early ABA stopped. Most gains faded, but parent-commissioned services held up better than clinic-led ones, flipping the 2002 worry about parent-managed care.

The 2002 warning still rings true: parent-run ABA without expert oversight helps only a little. If you supervise parents closely, as Diane et al. did, home programs can equal clinic results. Use the 2002 paper as a baseline, then add frequent BCBA check-ins, data reviews, and booster training to keep gains alive.