Ah, forgot that part. The 737 is considered one of the planes with the most memory items. Especially when compared to the airbus. We have currently 15 non normal lists with memory items, 4 of those in chapter 15 (Warning Systems) which deal with reaction to various warning. Many of those only 1 to 3 steps. But a few have more, the maximum is 7 in the Emergency Descent Checklist, which is usually the second checklist with memory items, the first (Cabin Altitude Warning or Rapid Depressurization) has a memory item which leads to this checklist, all in all a chain of 11 steps with decision steps.