The Post Cave Johnson Period

In 1981, Aperture engineers complete the Heimlich Counter-Maneuver and Take-A-Wish Foundation initiatives. The company announces products related to the research in a televised ceremony. Unsurprisingly, these products become immediately, wildly unpopular. After a string of highly publicized choking and despondent sick child disasters, senior company officials are summoned before a Senate investigative committee. During these proceedings, an engineer mentions that some progress has been made on Tier 3, the "man-sized ad hoc quantum tunnel through physical space, with possible applications as a shower curtain." The committee is quickly permanently recessed, and Aperture is granted an open-ended contract to secretly continue research on the 'Portal' and Heimlich Counter-Maneuver projects.
From 1981 to 1985, work progresses on the 'Portal' project. During this time, several high ranking Fatah personnel choke to death on lamb chunks despite the intervention of their bodyguards, showing that the US government has apparently put the Heimlich Counter-Maneuver to work.

As far as 1982, the Enrichment Center, where Test Subjects undergo tests, is functioning, as the Enrichment Center Test Subject Application Process, a 50-question questionnaire destined for applying Test Subject, is already used at that time. It is unknown if the Enrichment Center is already "computer-aided" in 1982, as scientists have known to supervise them from small offices until an undetermined date. The Enrichment Center Test Subject Application is operated by version 1.07 of GLaDOS, later "1.07a" and "1.09".

In 1985, the Aperture Image Format is created.

In 1985, the Aperture Image Format is maintained by Doug Rattmann.

In 1986, word reaches Aperture Science management that Black Mesa is working on a similar portal technology. In response to this news, Aperture Science begins developing GLaDOS.

In 1996, after a decade spent bringing the Disk Operating System parts of GLaDOS to a state of more or less basic functionality, work begins on the Genetic Lifeform component. During that time, the Aperture Science Red Phone plan is implemented in case GLaDOS appears to become sentient and godlike, requiring an employee to sit by a red phone on a desk in GLaDOS chamber's entrance hall.

In 1997, GLaDOS' version is 3.11.

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