I have done the TT and the main difference is that the american one is for all breeds and mixes (as long as the mixes is fixed they will get a certificate) and they have to be at least 18 mths of age, I have a female that has the TT title I believe the title is TC for the GSDC. I have read both and they both sound the same. You walk up to a stranger and they talk to you not the dog, then next stranger talks to dog not you, then someone shakes a bucket of rocks behind blind and then set it out for the dog to look at and they want the dog to put nose in bucket person is back out of sight, then you walk up to another blind and stand with back to it they fire 2/3 shots to test dog reaction, then walk up to someone that opens an umbrella, then next two is running on different surfaces and last one is protection test someone comes from behind a blind and starts yelling and waving a stick then they go and walk back, thats it, it is real easy if you ask me. I am taking my other 2 shepherds this year for the TT one.