The Kachru's model is in a dynamic nature. According to Kachru (1985), dividing English speakers into Inner, Outer and Expanding circles is preferable to the traditional native, ESL and EFL labels which involve the dichotomy between native and nonnative speakers (Rajadurai, 2005). English native speakers are visually not privileged since they are not placed at the top of the Three-circle Model. However, the model is not sufficiently dynamic to reflect the reality of English use in the world. It still prefers the English native speakers in the inner circle. The limitations of the model will be discussed in the following.
According to Patil (2006), the model assumes that the three circles represent linguistic reality perfectly. Kachru (1985) himself has noted that the concentric circles may be oversimplified and fuzzy areas exist. Some special cases like South Africa and Jamaica are difficult to be classified. As Kachru himself has acknowledged, the fact is that the categories are not necessarily mutually exclusive and grey areas exist between the circles (Rajadurai, 2005). Apart from the fuzzy classification between circles, Tripathi (1998) points out that there are no mechanisms to differentiate varieties within a circle. Therefore, Crystal (1997) suggests not defining the boundaries of Kachru's concentric circles in such absolute terms.
Kachru's model describes the Inner Circle, Outer Circle and Expanding Circle as 'norm-providing', norm-developing' and 'norm-dependent'. However, Crystal (1995) comments that the model cannot represent the reality of international English use because the reality is often not so clear-cut. Crystal wonders it is difficult to distinguish whether the Outer Circle looks to Inner Circle norms or it creates its own norms. Norms development is also possible in the Expanding Circle.
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