it's been over two years.. I have read parts of it to him, and parts of the art of NFP. He understands that I have to not have fertile mucous to be safe and my temp must go up at least .2 (or .4 according to nfp rules) for several days to prove ovulation. Can he read my chart? sort of. That's one of the reasons I wish we'd taken a class on it. The ccli classes are couple classes. I wish he knew more about charting so I could get his opinion when I'm unsure.