Labor efficiency, therefore, is not new idea. As far back as the late nineteenth and early twentieth centuries, many were spreading the gospel of efficiency. Indeed, individuals such as Carl Barth, H.L. Ganlt, Frank and Lillian Gilbreth, Morris Cooke, and Harrington Emerson had a keen interest in labor efficiency. However, it was Frederick Taylor who sought to explore organizational performance from the standpoint of task efficiency. Daniel A. Wren, in his books, The Evolution of Management Thought, describes Taylor’s approach as a job analysis in which he attempts to identify as many simple elementary movements a possible. Taylor selected the best method for each elementary movement by observing the most skilled worker at each, then timing and recording the movements. Taylor also developed a file of elementary movements and corresponding times, for use wherever possible on other jobs or classes of work.