Answer: What do you mean with "successful"?
Explanation: First of all, if you need to established the fact that an experiment has been successful, it needs to be viable. And in order to be viable, it has to be practical.
Second thing, are we really talking about a "planet" ? Nevermind.
Life index, grade of utility/usefulness, scale of danger to other species, adaptability, aggressiveness. These are just a few blanks that your experiment has to have on POSITIVE.
Predicting a result it´s almost impossible without these parameters.
Let me know if you want me to help you a bit more.