Hi, I have made some changes to pharo to make it more tdd oriented. I want to share them with you to know your opinion and then make the code public. The changes I made are: 1) When there is an error, the debugger opens directly. Reason: I found that I always press Debug when an error occurs in the Notifier window. Question: Should this option be a preference? 2) The debugger opens in a big window. Reason: I always want to debug! and I want to see as much as possible when debugging. Before I found myself making the debugger window bigger all the time 3) When compiling a method that sends a message not defined, it does not ask anymore if I want to change it. Reason: When doing TDD we work top-down, so we are always sending messages that are not defined and that we are going to define when running the test. Question: Should this option be a preference? 4) I added an option to save and run the test from the code pane of the omni browser (ctr+t). If the test fails, opens a debugger to fix it. Reason: It is very handful 5) I added an option to save and step a test from the code pane of the omni browser (ctrl+r). Reason: It is very handful (Problem: The debugger does not work well with breakpoints...) 6) I added a debugCase: message to TestResult and make some changes to the omni browser to show the result of debugging a test. Reason: Before, when debugging a test the browser was showing the test as not runned. 7) When running a test, the defualtAction of the MessageNotUndertood exception will ask you if you want to implement the method (if the receiver is not nil) so you don't have to select that option from the debugger stack list menu. Reason: When running a test 95% of the time a message not understood will be implemented and answering yes or no is easier that going to the stack menu of the debugger to select the option implement. What do you think? Comments welcome. Bye, Hernan.