Sociometry Founder: Jacob L. Moreno

Sociometry is a research method used to study the structure of social relationships within a group. It focuses on measuring the social status and social position of individuals within a group through direct investigation of social links. These links can be based on preferences, repulsions, attractions, or dislikes.

The concept and term "Sociometry" were first developed and introduced by Jacob L. Moreno. An Austrian-American psychiatrist, Moreno pioneered the field in the 1930s. He developed sociometry as a way to understand and improve interpersonal relationships and group dynamics. His work aimed to map out the social connections within groups, helping to identify leaders, isolates, and subgroups. Moreno also developed psychodrama, a form of therapy that uses dramatic enactment to explore and resolve personal and social issues.

Let's look at the other options to confirm why they are not the correct answer:

• S.R. Ranganathan: S.R. Ranganathan was a renowned Indian librarian and mathematician known for his five laws of library science and the colon classification system. His contributions are primarily in the field of library and information science, not sociometry.
• W.B. Sayers: W.B. Sayers was also a prominent figure in the field of library science, known for his work on cataloguing and library education. He is not associated with the introduction of sociometry.
• None of these: Since Jacob L. Moreno is correctly identified as the founder, this option is incorrect.

Therefore, the individual credited with first introducing Sociometry is Jacob L. Moreno.