text: So in conclusion, I disagree with the principal requiring students to attend after-school. It gives no particular benefit to the Student. Second, This ''after school'' tie can be used for better things. Finally, this takes away from the students personal time. Please consider the students when making decisions like this. Technology able to read the emotional expressions of students in a classroom is valuable because we could detect different type of moods even by making faces that wouldn't necessarily indicate a certain mood just by looking at their face. This sort of technology can benefit in more way's as well such as helping video game designers make their graphics more realistic and having characters resemble actual and more expressive moods.