Iago actions towards his Wife

1. What is Iago trying to make other people think?   

   Iago complains about his wife towards Desdemona, about how useless is wife is. He uses specific statements      such as " You are a picture out of doors", which is saying she is useless. He basically is just "Slandering" his wife, as Desdemona pointed out in fifth to last line. The last line that Iago says is that, basically his wife is only useful, when she sleeps. 

2. What tactics does Iago rely on to make his victims believe him? 

    In almost every line that Iago had in that excerpt, he only talked about how useless having a wife and thats all he talked about in that excerpt. It is pretty believable since is uses such harsh terms towards his wife and Desdemona, which is believable. Though he could also be joking around about his wife, but this can go either way.