I have tried a couple of tutorials on the web. I am using XCode 3.1. This is the latest one I have tried: http://www.cocoadevcentral.com/d/learn_cocoa_two/ Now I got to the end of the tutorial, but the application does not clear the textview as expected. I have run it under the debugger and the clearText method on the AppController is actually being called when I click the clear button. However the [textView setString: @" "]; does not do anything. I have downloaded the completed example from the site above, and while theirs works I can't see any obvious difference. The AppController has a clearText action and a textView outlet. Any suggestions on how I can work out what is wrong?