The reason for Iago's success is his ability to manipulate both the strengths and weaknesses of his enemies.

A fundamental reason for Iago's success is his ability to appear 'honest', which therefore giving him the power to manipulate and influence other characters. Iago manages to appear honest partly because of natural characteristics and partly because he purposely sets out to look honest. Before Iago can even begin to initiate his plan he is referred to as honest by many of the characters. This would suggest that this is a fundamental characteristic of his. Iago is able utilise the strengths and weaknesses of the characters effectively. Because Iago is so articulate he is easily able to manipulate Othello due to his lack of strentgh with conversation. This is also seen when he defends Cassio after the drunken brawl. Iago speaks with hesitation and refers to Cassio being a friend several times. Appearing honest, respectful and reliable allows him to gain favour with all characters, especially those of Cassio and Othello, allowing him to influence them. The success of Iago's deceptive honesty is most clearly seen in the final scene of the play in which the truth of his dishonesty is revealed.