CKDopps builds on the success of the Dialysis Outcomes and Practice Patterns Study (DOPPS) that has been conducted since 1996. The CKDopps team is a collaborative research relationship among experts in France, Germany, China, and Brazil, that uses its international scope to facilitate comparisons of nephrology practices in different countries. CKDopps examines variations in care for patients with advanced CKD to identify the most successful treatment practices, up to and including the transition to dialysis. These findings will provide important new insights for informing patients, clinicians, policy makers, and other stakeholders regarding best treatment practices. The overall goal is to develop an evidence base for the effective treatment of advanced CKD, thereby improving care and outcomes for future patients.