There are the Practice Exercise #1 problems sets for both Ch 23 and 21. They've been up since last Tuesday, 7/17. There are Tutorial problem sets up for both chapters. They are due by the following dates/times: Ch 23 Thur, 7/26, 8:00 AM Ch 21 Fri, 7/27, 8:00 AM (although some of these will need to be done for this week's quiz). Dr. Zellmer