For objective 1 (That the objects expand when its temperature increases and contract when decreases), look to see that: 1. Correctly predict that if anything increased in size when its temperature is changed because it heated, and if volume is decreased because it cooled. For example, the teacher can show a bottle with a balloon at the peak and immersed in a water bath. It asked students to tell if bath water is hot or cold without touching just watching the behavior of the globe. As seen here, to establish what things students should do to show they learned what we wanted to learn, we directly help thinking activities (the "as taught" or step 3.) 2. They predict that heating an object will increase its volume and cooled decrease. The teacher asked what happened with the water level if a tube is heated, the students must predict level rise.

This is especially useful when it happens in situations that were not discussed previously as described in the next point. 3. Identify the phenomenon of expansion and make predictions of the above in novel situations, different from those raised in initial discussions. One possibility is to explore in class two of the three states of matter (eg solid and liquid) and leave the third as "test". Then you can put a balloon in a freezer and see how it shrinks and becomes wrinkled and then how to normal out of the freezer. Students should be able to account for this phenomenon with what they know of other states.