A thesis statement is an invaluable part of an essay as it allows the writer to stay focused on the main purpose of the essay. It is a good idea to reread the thesis statement several times to ensure that the emphasis remains. Basically, a thesis statement supports whatever claims the writer may intend to make and it should persuade the reader, once the supporting evidence has been produced, and convince him to agree with the writer's point of view.
In Lord of The Flies, there are various topics which a writer could focus on, most of which hinge on the civilization versus savagery theme which William Golding portrays so vividly. Each topic could deal with a different aspect, such as the changes in the boys in the absence of "grown-ups;" the fact that Ralph and Piggy work so hard to maintain order, stressing the importance of the conch; the different priorities of Ralph and Jack as they compete for leadership; the importance of "the beast" and how if affects the decision-making; Jack's complete descent into unrestrained evil and also the brutal loss of innocence that completes the story.
Potential thesis statements, which would appear in the introductory passage, could be:
1)Jack's behavior and Ralph's inexperience cause the complete breakdown of all sense of decency and human compassion.
The main emphasis here could be on how, despite Ralph's best efforts and Piggy's help, Jack is a stronger character than Ralph, questioning everything and gradually breaking down Ralph's position, persuading the others to join his "tribe."
2)The conch represents the only hope the boys have of maintaining order. It is a symbol of democracy and civilization on the island where the boys find themselves.
Jack has little respect for the conch from the beginning and this is seen in his behavior and his treatment of Piggy. Jack uses and abuses the conch, which indicates his lack of respect for authority, and is ultimately responsible for its destruction. It is significant that Piggy dies when the conch is smashed.
3) "The Beast" signifies the unknown to the boys and they are afraid of it to the point of being irrational. Only Simon comes to an understanding of the fear that exists within each person. Jack capitalizes on fear and uses it and violence as a weapon to manipulate the boys in his attempts to be the leader.
Fear is a very real feeling for the boys, once the euphoria of being on a deserted island, with no adult supervision, subsides. The fact that the beast is a figment of the imagination does not make it any less scary. Basic instincts take over when Ralph's leadership style is not sufficient to maintain order and to stop Jack from forcing the boys to accept his "hunter-or-be-hunted approach.