Intelligibility is the term most generally used to address the complex of criteria that describe, broadly, how useful someone’s English is when talking or writing to someone else. Set within the paradigm of world Englishes – which posits that the Englishes of the world may be seen as flexibly categorized into three Circles (Inner, Outer, Expanding) in terms of their historical developments – this text provides a comprehensive overview of the definitions and scopes of intelligibility, comprehensibility and interpretability