Frederick Taylor was one of the earliest management theorists and pioneered the concept of Scientific Management in the early 20th century. He studied how work was performed and sought to optimize jobs and standardize tasks to increase productivity. Taylor developed four principles of scientific management including replacing rule-of-thumb work with scientific study of tasks, matching workers to jobs based on capability, providing supervision to ensure efficient work methods are used, and having managers focus on planning and training to allow efficient work. While influential, Taylor's theories broke work into small specialized tasks and are at odds with modern approaches emphasizing autonomy, flexibility, teamwork and incorporating worker ideas.