This is probably a very stupid question, but how would you stop a script from running when it encounters an error whilst providing a useful error message? Consider the following code: Code: set temp to display dialog "Please enter a positive number?" default answer "" set userNumber to 0 try -- Try to parse the entry as a number set userNumber to text returned of temp as integer on error -- Entry was not a number so display error message display dialog "Data entered is not a number" end try As far as my script is concerned, receiving data other than a number is considered as fatal and I wish for the script to abort but I want to provide the user with feedback. Providing the "on error" statement allows me to handle the error but I can't seem to see how to stop the script from running as the script continues to execute after the "end try" statement even with an error. Do I need to break the key parts of my program into separate subroutines that can be accessed using conditional logic (i.e. they aren't run if the data provided is not valid) or is there a simple way to stop execution?