(abbreviation) the Four Modernizations of agriculture, industry, national defense, and science and technology, a policy initiated by Deng Xiaoping.

(abbreviation) the four criteria for selecting government officials: being more revolutionary, younger, better educated (年轻化 nián​qīng​huà and related slogans), and more professionally competent (专业化 zhuān​yè​huà)

(of Chinese characters) the processes of standardizing, systematizing, specializing, and quantifying