The emphasized the study of employee attitudes and informal group dynamics in the workplace.

The Human Relations School of Management emphasized the study of employee attitudes and informal group dynamics in the workplace.

Explanation:

Elton Mayo, a well known Harvard Professor, along with his colleagues establishes this school which further investigated the Hawthorne Studies in 1927. Elton Mayo reached to a conclusion that employee attitudes, moods and the group dynamics plays a vital role at the workplace. He manifested that group standards, social norms, rest breaks, working day length, wage plans (both of groups and individuals) are the most important factors which decides the employees productivity. His study was then further proved a significant milestone for the Organisational Behaviour Discipline.

the assumption the narrator makes in this excerpt is that the messages he heards were going to hurt the narrator's mom; the narrator just springs in to action. the narrator doesn't specify in this excerpt why he believes that the messages present a problem that requires protection.