this book shows what girls go through in middle and high school to fit it, and peer pressure. in the book Spencer, Aria, Emily, and Hanna are all pressured to do things they don't want to by Alison, just so they can fit in. they don't know how to say no to Alison, they worship her. but at the same time they hate her. i think that in this text Alison's point of view is missing. all the others girls point of view is included except hers, she talks in the book and does things. but we don't really get to see the world through her eyes.
the effect that this has is that we see Alison as kind of a "bully" and a stubborn brat. the girls are always saying how she is flirting with her sisters boyfriend and she wants everything perfect and her way. since Alison's voice is excluded we don't get to know why she really acts this way. maybe she has low self-esteem and just wants to cover it up. maybe she hasn't ever had a real friend so she thinks that this is the way to treat them, to make sure that they never have the courage to leave her.
since Alison's perspective is excluded all the other girls stand out more. so we focus in on them and what they are saying , and since they are all saying negative and mean things about Alison. it leads us into thinking that they are right and that she really is this person.