With her husband Frank, Lillian Moller Gilbreth developed the time and motion study to increase industry's efficiency and output. The Gilbreths launched an industrial consulting firm in Providence, RI, which they later moved to Montclair, NJ. The Gilbreths' application of their efficiency methods to their home and their 12 children was described by two of the children, Frank B., Jr., and Ernestine Gilbreth Carey, in Cheaper by the Dozen and Bells on Their Toes.