This is book 2 of the Connecting the Dots series, recertification for the OASIS C1. Inside are direct CMS definitions and item intent descriptions as well as insight into what the questions are actually asking. This book also covers the "5 day window" with calendar examples.
As always, I'm not pretending to be an expert. I'm just trying to save a nurse new to home health the trouble of learning this stuff the hard way.