2019, Li Huang, James Lambert, “Another Arrow for the Quiver: A New Methodology for Multilingual Researchers”, in Journal of Multilingual and Multicultural Development, →DOI, page 1:
The methodology, which we have named the Aural-Oral Transect (AOT), is a systematic, easy-to-implement, unbiased way of collecting quantitative data on spoken language use in multilingual settings.