The NICHD Investigative Interview Protocol is the most extensively validated framework for interviewing children about suspected abuse. A core contribution is its taxonomy of interviewer prompt types, ordered by how much they shape the child's answer — from open, input-free invitations that elicit free recall, to suggestive prompts that communicate the expected response.
Unlike most scales here, NICHD codes the interviewer's utterances, not the child's. Each interviewer prompt is highlighted and labelled with one of five types. Best-practice interviewing maximizes Invitations and Cued Invitations and minimizes Option-Posing and (especially) Suggestive prompts. This makes the scheme a training and quality-assurance instrument as much as a research code.