It is crucial that you are clear about what you want your students to learn during each lesson. The effect that such clarity has on student results is 32% greater2 than the effect of holding high expectations for every student (and holding high expectations has a sizeable effect). If you cannot quickly and easily state what you want your students to know and be able to do at the end of a given lesson, the goal of your lesson will be unclear. Clear lesson goals help you (and your students) to focus every other aspect of your lesson on what matters most.
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Check out the article Setting Lesson Goals Is A Quick Way to Boost Student Achievement