Chapter 7 BPR

I am left with questions after reading Janet Allen's example of how we can use vocab instruction to increase content knowledge. The example assignment titled The Poop on Poop made me question whether the student would really delve into a discussion about the words or rather look in the back of the text book or dictionary to find the word and quickly finish the assignment. How could we structure an assignment like that so that students would be engaged in a discussion over vocabulary words? I also like the idea of the graphic organizer but that could consume a great deal of instruction time in order to get through it. Could you pretest for vocabulary words related to the unit you are teaching and then have students create graphic organizers over the vocabulary words that most students didn't know?