A problem for asch’s study was it would have been difficult for the confederates to act convincingly when giving the wrong answers as they were fully aware of their role.causes problems for the validity of the experiment and cause demand characteristics so participants guess the aim of the experiment if act unconvincingly. However mori and ari overcame this by giving them glasses which meant they saw the lines differently and the wrong answers they were giving were genuine, these results closely matched what asch found in his experiment showing that the confederates had acted convincingly.