- 1. A robot may not injure a human being or, through inaction, allow a human being to come to harm.
- 2. A robot must obey any orders given to it by human beings, except where such orders would conflict with the First Law.
- 3. A robot must protect its own existence as long as such protection does not conflict with the First or Second Law.
- Zeroth Law: A robot may not harm humanity, or, by inaction, allow humanity to come to harm.
- Lyuben Dilov's Forth law: A robot must establish its identity as a robot in all cases.
- Harry Harrison's Forth law: A robot must reproduce. As long as such reproduction does not interfere with the First or Second or Third Law.
- Nikola Kesarovski's Fifth law: A robot must know it is a robot.