Compose a lesson objective. Make this objective a sentence starting “students will be able to ...” Explain what specific thing you want your students to be able to do upon completion of the lesson in question. You could, for example, say, “students will be able to count to 10.” Indicating your desired end goal.
Plan a full-group instruction section. Start your lesson with a short period in which you speak to all students, and explain the basics of the topic at hand. Make this section of the lesson short to ensure that you don't lose their attention -- an overly long explanation will likely bore your pupils.
Create a transition to a practice activity. Devise a way to move from this instruction to the application portion of the lesson in which you have students try what you have explained. Because students will likely be doing slightly different things during this section of the lesson, you can divide students into groups. Give separate instructions to each, allowing each student to understand what is expected of him.
Develop multiple product options for students to create. If students are going to demonstrate their understanding by completing a worksheet, don’t copy just one worksheet and present it to all students. Instead, select several worksheets of varying complexity, allowing you to present students with worksheets at their levels. Similarly, if students are going to create posters or models, create different expectations for students of differing ability levels. You may, for example, expect weaker students to simply create posters depicting the alignment of the planets, while you might ask higher-performing students to craft a scale model.
Group the students based on their ability level. Place them into ability-related groups. Create displayable lists of these groups to put in front of the class so they can go into these groups when they complete the planned products if you want them to complete the products as groups. If you want students to work individually, you can list these groups in your lesson plans. But keep them from the students -- you don't want to allow them to see how they rank among their peers.