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In ISRD4, the standard School-Based Sample ISRD4 survey was complemented with a methodological study using a much shorter version of the ISRD4 questionnaire designed for iPhones or smartphones for the Internet Sample (IS). In some countries, the Internet-based sample succeeded, while in others, it did not. At the end of data collection in 2024, the steering committee interviewed the national teams to look deeply for the factors that impacted the success or failure of the internet-based sample mode.