The phrase "a system whose" is grammatically correct and can be used in written English.
It is used to show possession or ownership by a system or entity. Here's an example: "The company implemented a new system whose goal is to increase efficiency."
It was a system whose effects continue to ripple outward.
Poitras wrote that, in their early exchanges, Snowden told her that the U.S. surveillance apparatus is a "system whose reach is unlimited but whose safeguards are not".
That this most traditional of camera makers has taken the plunge into the world of mirrorless shows that this is a system whose time has come.
Mr. Pollack concedes there is immediate stress on a system whose configuration is based on old assumptions as to where the needy live.
More important, Kim Jong-un inherits a system whose legitimacy, such as it ever was, is being rotted away from below.
The teachers walking out of classrooms in Oklahoma this week are asking for an overhaul of a system whose needs have been evolving for decades.
Far from threatening a superb health care system, reform should be seen as a way to improve a system whose bright spots are undercut by its flaws.
There's a take-no-prisoners approach that does take prisoners: all of us, incarcerated in a system whose crippling partisanship is fueled in part by the hyperbolic language, bellicose tactics and Manichaean tone of candidates and their handlers.
It was Americans, not Africans, who created in the South the largest, most powerful slave system the modern world has known, a system whose profits accrued not only to slaveholders but also to factory owners and merchants in the North.
These people were caught up in a system whose sole reward — Warhol paid his assistants little and his actors nothing in the Factory years — was proximity to the artist.
Gorbachev's reforms served to release hopes and theoretical possibilities that collided with the realities of a system whose supporting beams could not be moved without the entire edifice crashing down.
