Intervention steps

Intervention videos

1

2

3

4

5

1

All required materials were well prepared.

2

Intervene with the participant in a planned place.

3

Use five prompt methods to induce the participant to talk according to the content of the picture book.

4

Wait for the participant to answer and make an evaluation.

5

Expand the program based on picture books or the participant’s answers.

6

Ask the questions in the “Induction” to guide participant to say more novel ideas or answers, and encourage or comfort her if she fails to answer.

Procedural Fidelity = the number of correctly executed items/the total number of items × 100%