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Ph.D. theses Genre Analysis in Academic Writing (AW) authored in English were explored in this research. For the research corpus, 120 texts from six disciplines were gathered together. An effort was made in this research to determine whether or not the variable of discipline had an effect on the generic structure and linguistic choices taken to change thanking actions in the building of AW. It was discovered that there were modest differences in the use of AW methods between Ph.D. students in soft science and those in hard research. Research field, academic practices, exposure to the English language, language competency, and socio-cultural norms or expectations all had a role in the variety. It also proposes that ESP teachers’ pay attention to the macro and micro levels of analysis of AW in order to help their students build a sense of both broad socio-cultural and small language viewpoints as they learn to write acceptable acknowledgments for their academic writing.