Teaching immunology is very complex. Understanding what white cells do in fighting pathogens (disease organisms) is difficult for students. For several years I had students fill out a white cell table as homework - name of cell, function, and does it move in the body. I tell students to have it ready for the next lecture. I then have students write on a blank table on the board filling in info at the next lecture. I did not any assessment to see if this table worked. This semester I did not assign the table as homework to do outside of class, I walked through immunology and in lecture I directed them to fill in their table as we went. I thought having them do it outside of class was not worthwhile and takes more time in class. Boy was I wrong. In Fall14, n= 36, the average on a prompt to identify cells when given their function (11 prompts, 11 pts) was 6.7. Zero students recieved 11/11 and 3 students received 10/11. For Sp15 n= 38, the average was 8 with 11 students recieving a perfect score of 11 and 5 students 10/11. Obviously, assigning the table as homework outside of class shifted the data - more students were successful on this prompt.