Jenö Kollarits (1866-1940) should have been famous. He presented the first logical theory and causal mechanisms of human error, not to mention inventing the concept of ergonomic design. But, at the time of his death in 1940, he and his work were virtually unknown. His 1937 book Dyspraxias, written while he was a tuberculosis patient in a sanatorium, may be the first diary study of human error. It is here translated for the first time from German. The text is supplemented with commentary by John W. Senders, Ph.D, one of the pioneers of the field of Engineering Psychology. Professor Senders has a long and influential career spanning six decades as a psychologist and human factors engineer. The application of his work has had an impact in a diverse range of domains including the design of space vehicles, modeling of driver behavior, highway safety, pilot behavior, airplane cockpit design, medication errors and patient safety, nuclear power plant safety, and even electronic publishing.