The Academic Research Consortium (ARC) and the Standardized Data Collection for Cardiovascular Trials Initiative have recently published updated clinical and angiographic endpoint definitions for percutaneous coronary intervention trials. The aim of this document is to provide practical guidance to facilitate and harmonize the implementation of those definitions in randomized trials or registries, as well as to foster consistency among independent adjudication committees. The authors compared the ARC-2 and Standardized Data Collection for Cardiovascular Trials Initiative definitions to identify areas of consistency, complex scenarios, and definitions in need of further standardization. Furthermore, the authors compared the fourth universal definition of myocardial infarction with the ARC-2 definition of myocardial infarction. The Society for Cardiovascular Angiography and Interventions definition of periprocedural myocardial infarction was also compared with the ARC-2 definition and the fourth universal definition of myocardial infarction. An in-depth assessment was done for each individual clinical endpoint to guide clinical investigators on reporting and classifying clinical adverse events. Finally, the authors propose standard streamlined data capture templates for reporting and adjudicating death, myocardial infarction, stroke, revascularization, stent or scaffold thrombosis, and bleeding.