The document defines group discussion as a method used to assess students' personalities through discussion of various topics in a group setting. It lists the prerequisites for effective group discussion as knowledge of discussion topics, communication skills, presentation skills, and remaining calm. The benefits of group discussion include expanding knowledge, understanding strengths and weaknesses, and revealing leadership qualities. The document provides dos and don'ts for group discussions, emphasizing the importance of active listening, supporting arguments, and avoiding interruptions or changing opinions frequently.