Taylor believed that all workers were motivated by money, so he promoted the idea of "a fair day's pay for a fair day's work." In other words, if a worker didn't achieve enough in a day, he didn't deserve to be paid as much as another worker who was highly productive.
With a background in mechanical engineering, Taylor was very interested in efficiency. While advancing his career at a U.S. steel manufacturer, he designed workplace experiments to determine optimal performance levels. In one, he experimented with shovel design until he had a design that would allow workers to shovel for several hours straight. With bricklayers, he experimented with the various motions required and developed an efficient way to lay bricks. And he applied the scientific method to study the optimal way to do any type of workplace task. As such, he found that by calculating the time needed for the various elements of a task, he could develop the "best" way to complete that task.
These "time and motion" studies also led Taylor to conclude that certain people could work more efficiently than others. These were the people whom managers should seek to hire where possible. Therefore, selecting the right people for the job was another important part of workplace efficiency. Taking what he learned from these workplace experiments, Taylor developed four principles of scientific management. These principles are also known simply as "Taylorism".