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While responding to web surveys, respondents cannot only use PC, but other devices (smartphone, tablet). Researchers are therefore faced not only with the need to develop optimal questionnaires for the mixed devices to increase measurement quality, but also with the comparability of data obtained with different devices. Whereas some researchers analyze differences in response and non-response, response rates and possible sampling bias associated with a device, the questions regarding measurement quality and measurement equivalence remain not answered. Particularly important are the main measurement quality criteria within the frame of the Total Survey Error – such as reliability and validity. In this session, we welcome papers which address measurement quality and comparability due to measurement error between devices, effects of different aspects of questionnaire design for various devices on measurement errors and measurement quality, usage of para-data when investigating measurement errors or comparability, and relationships between questionnaire design, response behavior and measurement quality or comparability in mixed device surveys.