Solution
Option 1 -> Harmony, Not Discord focuses on creating cooperation between management and workers to reduce conflicts, not about developing standard methods.
Option 2 -> Science not Rule of Thumb emphasizes replacing traditional, outdated practices with scientifically developed and standardized methods throughout the organization.
Option 3 -> Cooperation, Not Individualism deals with teamwork between management and workers rather than individual efforts, not specifically about standardization.
Option 4 -> Development of each and every person to his/her greatest efficiency focuses on training and developing workers to their maximum potential, not on creating standard methods.
Hence, Option 2: Science not Rule of Thumb -> The statement clearly mentions developing a "standard method" to be followed throughout the organisation, which is the essence of this principle - replacing rule-of-thumb or traditional methods with scientific, standardized approaches based on systematic study and analysis -> correct