A thesis statement focuses your ideas into one or two sentences. It should present the topic of your paper and also make a comment about your position in relation to the topic. Your thesis statement should tell your reader what the paper is about and also help guide your writing and keep your argument focused.
Generalization is making a general, broad statement from something specific. For instance, if you read that a dog chases squirrels, and you conclude that all dogs do the same, you are making a generalization.
Generalizations, however, cannot be successfully made if the information is not openly stated. Readers often make conclusions based on information that is described to them in detail. If the information is not specifically stated in the material they are reading, they will not perceive the message and make generalizations.