The extant nomenclature for tetralogy of Fallot (TOF) is reviewed for the purpose of establishing a unified reporting system. The subject was debated and reviewed by members of the STS-Congenital Heart Surgery Database Committee and representatives from the European Association for Cardiothoracic Surgery. All efforts were made to include all relevant nomenclature categories using synonyms where appropriate. The general categories of TOF are: classic TOF with varying degrees of pulmonary stenosis, TOF with common atrioventricular canal defect, and TOF with absent pulmonary valve. Although centers may choose to code a fourth general category, TOF with pulmonary atresia, this lesion will be grouped with pulmonary atresia-ventricular septal defect for multi-institutional analysis. A comprehensive database set is presented that is based on a hierarchical scheme. Data are entered at various levels of complexity and detail that can be determined by the clinician. These data can lay the foundation for comprehensive risk stratification analyses. A minimum database set is also presented that will allow for data sharing and would lend itself to basic interpretation of trends. Outcome tables relating diagnoses, procedures, and various risk factors are presented.