We should consider the reliability and the credibility of what he is portraying. He uses a research by Caroline Hoxby as a rebuttal that class sizes really don't have any sort of effect. This is where his bias comes in handy, Gladwell wants to prove that smaller class sizes do help. But the thing is research does show that class size can be a beneficial factor. Evidence that smaller class size may help is “one of the earliest influential meta-studies was by Glass and Smith in 1979. They statistically analyzed 300 reports involving almost 900,000 students. Once class size fell below about 15, learning increased progressively as class size became smaller” (Mathis, 60). One can say that Gladwell’s bias is fitted. The only thing is Gladwell uses a credible source very few times. he tends to focus his reasoning on teachers interviews, basically the teachers self preference of classes. Some disagree, “I had a class of nine students and grade-twelve Academic French. Sounds like a dream, doesn't it? It was a nightmare! You can't get any kind of conversation or discussion going in the target language. It's difficult to play games to reinforce vocabulary, grammar skills, etc. the momentum just wasn't there” (Gladwell, 58). Some agree, “My perfect numbers eighteen: that's enough bodies in the room that no one person needs to feel vulnerable, but everyone can feel important. Eighteen divides handily into groups of two or three or six. With eighteen students, I can always get to each one of them when I need to” (Gladwell, 56). The opinions used are not reliable since they are opinions in fact it tells the reader what the teachers specifically like not proving to the reader anything that may have been done to show class sizes affecting learning in