- Three scholars developed similar models to characterize varieties of World Englishes: Tom McArthur's wheel model (1987), Manfred Gorlach's circle model (1988), and Braj Kachru's model (1988).
- McArthur's model had a central "World Standard English" surrounded by regional standards and emerging standards, and outer local varieties. However, it conflated different types of English and excluded European Englishes.
- Gorlach's model addressed some criticisms but was also inconsistent in excluding English as a foreign language.
- Kachru's model conceptualized Englishes more broadly, with an Inner Circle of norm-providing English varieties, an Outer Circle
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