A recent peer-reviewed paper discussed the concept and procedure known as errorless learning and compares its efficacy training dogs to that of the more typical trial-and-error approach to learning. One of the authors of the paper: Comparing Trial-and-Error to Errorless Learning Procedures in Training Pet Dogs a Visual Discrimination, Dr. Eddie Fernandez discusses the process and its favorable impact on the subjects' frustration, behavior acquisition rate, and failure compared to trial and error learning.  The goal is to uncover ways to minimize any harmful effects on animal welfare during the learning process. Animal Care Software