Shortening informant surveys and routing them through participants raises informant response rates.

Evidence

The informants were intentionally provided fewer items and response formats in their measures in order to increase their response rate. … Informants were asked to complete the questionnaire, seal it in an envelope, and return it to the participant. — Sherman A. Lee, Chelsea A. Reid, Stephen D. Short, Jeffrey A. Gibbons, Ruth Yeh, and Matthew L. Campbell, Fear of Muslims, 93

Categorization

• XREF: Connects to recurring survey-methodology tradeoffs between response rate and measurement equivalence across informant and self-report forms.