In 1999 Colonel Qiao Liang and Colonel Wang Xiangsui wrote a book called Unrestricted Warfare. In this book, these officers, who were both active-duty officers in the Chinese People’s Liberation Army (PLA) discussed the lessons learned from the Gulf War action in 1990. The book was published by the PLA Literature and Arts Publishing House in Beijing, which suggests official approval by the PLA Command.
This and other examples caused these officers to postulate another type of warfare they called unrestricted warfare, which crossed all of the spectrums of society and involved no rules. The authors listed 15 types of new warfare to be used in order to avoid the standard military conflict.