The term of audit expectation gap (AEG) was created nearly 50 years ago and has received the attention of many researchers. Despite a lot of research on AEG, the method of measuring AEG remains controversial. The number of studies which propose the method of measuring AEG is limited and there are many problems when applying these methods in empirical studies. Inherited from previous studies, this paper aims to develop a new method of measuring AEG and proves it by the results from the

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... n of this method in empirical research in Vietnam. The article achieves two important results: (1) Proposing a new method of measuring AEG based on the Porter's definition and structure of AEG; and (2) Proving the results from the application of the new method for measuring AEG by conducting empirical research in Vietnam.