The Three Laws
The "Official" Laws
Handbook of Robotics
The NS robot with a modified First Law . The new law was stated as "No robot may harm a human being".
Susan Calvin first suggested the existence of a Zeroth Law of robotics. "No robot may harm humanity or, through inaction, allow humanity to come to harm". The First to Third Laws should be amended accordingly.
Elijah Baley claimed, during a murder investigation on Solaria, that the First Law had always been misquoted. He suggested the First Law should be restated as "A robot may do nothing that, to its knowledge, will harm a human being; nor, through inaction, knowingly allow a human being to come to harm".
The Three Laws of Susan Calvin
The planet-organism Gaia, adapted the first law as a philosophy.