Academic writers with different linguistic backgrounds communicate scientific findings following objective norms, although they do so in different ways, as is evidenced in intercultural studies. This chapter focuses on the identification of boosters and hedges used by Spanish and Chinese researchers to persuade readers about scientific findings in engineering and linguistics. The objectives were to categorize and compare the frequencies and functions of hedges and boosters used by nonnative writers of English, to study whether there are any linguistic and cultural differences, and to identify boosting and hedging features different from those used in English as a mother tongue. The material was a corpus of 120 academic papers on linguistics and engineering papers written by Spanish and Chinese researchers. Boosters and hedges were spotted and occurrences extracted and classified with METOOL, a tool designed to identify metadiscourse markers. In the results, it was shown that Chinese writers used more boosters and hedges than their Spanish peers. To conclude, it was observed that although Chinese and Spanish writers tend to be assertive in their mother tongue, mitigation was used to adopt an academic style.