The Otis Group Intelligence Scale: Manual of Directions for Primary and Advanced Examinations, 1920 is a book written by Arthur Sinton Otis. The book provides a comprehensive guide to administering and scoring the Otis Group Intelligence Scale, which was developed by Otis in 1917 as a way to measure intelligence in groups. The manual includes detailed instructions for administering both primary and advanced examinations, as well as information on interpreting results and using the scale for research purposes. The book was first published in 1920 and is considered a seminal work in the history of intelligence testing.This scarce antiquarian book is a facsimile reprint of the old original and may contain some imperfections such as library marks and notations. Because we believe this work is culturally important, we have made it available as part of our commitment for protecting, preserving, and promoting the world's literature in affordable, high quality, modern editions, that are true to their original work.