Challenge	Potential Solution
Nonresponse	Consider incentives and prenotification.
Coverage due to mode of data collection	Consider multimode collection.
Self-reported data	Consider measurements on an in-person subsample.
Coverage (young age groups and language barriers)	Consider use of cellular phones and employ bilingual interviewers.
Data quality	Institute data quality protocols and checks.
Small sample size	Oversample in certain areas, use small-area techniques.
Cost	Charge for certain questions, use survey for evaluation and get funding as part of the intervention, use multimode data collection.
Limited space for questions	Consider rotating surveys.