She analyzed conversations among her students to discover what helped them engage in class discussion. The class she chose as her subject had eleven women and nine men. Tannen said she observed the class for a good portion of the time and concluded that almost all the men spoke in class from time to time. The student who talked the most in class was a woman, but then she mentions that almost half of the women didn't talk at all in class. Tannen decided to divide her class so that she could prove her thesis that having both sexes in the same class is a problem. She analyzed the students, separated them into three groups that were relevant to each, based on their degree, gender, and the conversation style she observed in each student. Naturally, she focused on how chatty the all-female group became once the men left. At this point in her essay, she focused too much on what she was trying to prove with her thesis statement rather than truly giving readers the opportunity to consider the other side of the story. As Tannen went on to explain the experiment she conducted in class, she began to deviate by including the ethnicity of some students. International students tend to speak less, regardless of their gender, thus compromising the validity of their contribution. The information provided towards the end of the essay began to lose relevance. This part of her essay was very weak, showing obvious bias as she shared the information.