Why do dialect researchers use questionnaires when creating linguistic atlases?

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Thematic map of Europe displaying the distribution of Germanic languages, with different colors indicating regions where English, German, Netherlandic (Dutch), Frisian, Swedish, Danish, Norwegian, Icelandic, and Faroese are spoken. Striped areas mark regions where bilingualism is common, and language regions cover countries such as the United Kingdom, Germany, the Netherlands, Denmark, Sweden, Norway, Iceland, and parts of surrounding countries. — Dialect Distribution of the Germanic languages in Europe.

Dialect researchers utilize questionnaires when creating linguistic atlases primarily to ensure the collection of uniform data across a large number of geographic locations. By using a standardized set of questions, researchers can compare linguistic features systematically, allowing for a panoramic examination of dialectal phenomena.1

The use of questionnaires facilitates two main methods of data collection:

Fieldwork: Trained investigators use questionnaires to transcribe dialectal forms directly, which provides more precise data and allows for a broader range of diverse questions.1
Survey by correspondence: This method allows researchers to cover more geographic points at a lower cost and with less time, though it often relies on non-specialists—such as local schoolteachers—to record the data.1

While questionnaires are essential for achieving commensurability across different regions, they do introduce a degree of schematization that lacks the spontaneity of free conversation. Consequently, researchers often supplement these atlases with dialect dictionaries or monographs to provide a more comprehensive linguistic analysis.1