GLaDOS, known in full as the Genetic Lifeform and Disk Operating System, is the computer system designed to control and oversee Aperture Laboratories, as well as the guide of the Aperture Science computer-aided Enrichment Center. She has the ability to shift and move the facilities and the chambers, making for seamless and almost infinite testing design.
During the development of Portal 2, playtesters complained that GLaDOS was "too mean", and it was concluded that some of her dialogue was too extreme. Due to this, elements of the dialogue were reworked and resulted in the creation of GLaDOS' more amicable, passive-aggressive personality.
