Evaluation of developmental surveillance by physicians at the two-month preventive care visit.

Three resident doctors watched two-month-old babies during routine check-ups.

The researchers gave each doctor a short lesson on spotting early delays.

Then they handed over quick, personal feedback after every visit.

All three residents got better at catching signs of delay.

They asked the right questions and filled out checklists correctly.

The gains showed up right away and held steady.

Geurts et al. (2008) ran the same recipe—brief lesson plus feedback—and turned 16 staff into preference-assessment pros in one shot.

Bachmeyer-Lee et al. (2020) moved the idea to parents: written steps plus live feedback pushed feeding skills past 90% without any modeling.

Van Arsdale et al. (2025) later took the whole package online; 16 trainees still nailed mealtime assessments.

Together the chain shows the tiny combo works for doctors, parents, and remote staff alike.

You can copy the two-step package anywhere. Teach a mini-module in five minutes. Hand over one line of praise or correction right after the skill. Use it to sharpen supervision, parent coaching, or staff onboarding without long workshops.