Abstract: This research paper delves into the intricate relationship between quality assurance measures and their consequential effects on time overrun, cost overrun, disputes, and litigation within Engineering, Procurement, and Construction (EPC) contracts of National Highway. Through an extensive qualitative study and in-depth analysis in SPSS, this paper aims to shed light on the critical high risk contract clauses which make project delays, budget overruns, and legal conflicts impacted by quality. The findings presented herein offer valuable insights for stakeholders in the construction industry seeking to enhance project performance and minimize legal liabilities through effective quality control mechanisms. Contractors, consultants, and employees of the authority were handed a questionnaire survey as part of this investigation. Google Forms was used to gather 161 replies. Principal component analysis was used in SPSS to analyse the aforementioned data. The result shows that there are a number of crucial (high risk) contract elements in EPC contracts that could lead to litigation.