Developments in industry in recent years have made employee learning a critical factor in organizations' success. The ever-faster pace of technological development and the variety of tasks that business professionals must perform mean that on-the-job learning is a constant, too quick and vital to be left to training departments. And yet, management knows too little about how workers learn on the job and does not give sufficient time and effort to understanding this process. As learning is largely left to chance, it is amazing that it happens at all, and well enough to enable workers to be...