The PERC Mentor library of modules provides a curriculum for the training of percutaneous renal access, offering both Essential Skills Training and virtual patient cases, which reflect real-life situations encountered in a hospital operating room. The Essential Skills Module provides a relaxed environment, in which the trainee can acquire the skills that are essential to building confidence with kidney puncturing. The virtual patient cases provide training on puncturing the right or left kidney for both normal and obese patients, which are more challenging.