This two-part post is a summary of some of the dilemmas I have faced as an observer since 1994, when I sat in on another teacher's lesson for the first time. My intention is to raise a few (hopefully) relevant questions without necessarily proposing any easy - or complex - answers or solutions. I will use the pronoun you to invite you to either wear your observer's hat or put yourself in an observer's shoes. For the sake of reader-friendliness, I will alternate between he and she when referring...