Qi Men Dun Jia is an ancient form of divination

Divination

Divination is the attempt to gain insight into a question or situation by way of an occultic standardized process or ritual...

 from China

China

Chinese civilization may refer to:* China for more general discussion of the country.* Chinese culture* Greater China, the transnational community of ethnic Chinese.* History of China* Sinosphere, the area historically affected by Chinese culture...

, which is still in use in China, Taiwan

Taiwan

Taiwan , also known, especially in the past, as Formosa , is the largest island of the same-named island group of East Asia in the western Pacific Ocean and located off the southeastern coast of mainland China. The island forms over 99% of the current territory of the Republic of China following...

, Singapore

Singapore

Singapore , officially the Republic of Singapore, is a Southeast Asian city-state off the southern tip of the Malay Peninsula, north of the equator. An island country made up of 63 islands, it is separated from Malaysia by the Straits of Johor to its north and from Indonesia's Riau Islands by the...

 and the Chinese diaspora in Southeast Asia

Southeast Asia

Southeast Asia, South-East Asia, South East Asia or Southeastern Asia is a subregion of Asia, consisting of the countries that are geographically south of China, east of India, west of New Guinea and north of Australia. The region lies on the intersection of geological plates, with heavy seismic...

. Qi Men Dun Jia may be applied to business, crime-solving, marriages and matchmaking, medical divination, Feng Shui, military affairs, finding missing people, travel, personal fortune divination etc.

Along with Da Liu Ren

Da Liu Ren

Da Liu Ren is a form of Chinese calendrical astrology dating from the later Warring States period.Along with the divination methods Qi Men Dun Jia 奇门遁甲 and Taiyi 太乙—collectively known as the "Three Styles" —Da Liu Ren is considered in China to be one of the highest forms of Chinese metaphysics.It...

 and Tai Yi Shen Shu

Tai Yi Shen Shu

Tai Yi Shen Shu is one of the three 三式 predictive arts from China, the others being Da Liu Ren and Qi Men Dun Jia.These arts are basically involved in divination and to a certain extent astrology...

 it is one of the collective Three Arts or Three Styles (三式 sān shì), China's highest metaphysical arts.
Originally devised to help form military strategy

Military strategy

Military strategy is a set of ideas implemented by military organizations to pursue desired strategic goals. Derived from the Greek strategos, strategy when it appeared in use during the 18th century, was seen in its narrow sense as the "art of the general", 'the art of arrangement' of troops...

 and tactics, Qi Men Dun Jia was in use as long ago as the period of Chinese history known as the Warring States, and is believed by Chinese scholars to have been used at the Battle of Red Cliffs

Battle of Red Cliffs

The Battle of Red Cliffs, otherwise known as the Battle of Chibi, was a decisive battle at the end of the Han Dynasty, immediately prior to the Three Kingdoms period of Chinese history. It was fought in the winter of 208/9 AD between the allied forces of the southern warlords Liu Bei and Sun Quan...

 in the defeat of Cao Cao

Cao Cao

Cao Cao was a warlord and the penultimate chancellor of the Eastern Han Dynasty who rose to great power during the dynasty's final years. As one of the central figures of the Three Kingdoms period, he laid the foundations for what was to become the state of Cao Wei and was posthumously titled...

's ship-borne army.

Liu Bowen is believed to have secured the throne for the Ming

Ming Dynasty

The Ming Dynasty, also Empire of the Great Ming, was the ruling dynasty of China from 1368 to 1644, following the collapse of the Mongol-led Yuan Dynasty. The Ming, "one of the greatest eras of orderly government and social stability in human history", was the last dynasty in China ruled by ethnic...

 emperor by applying Qi Men Dun Jia to his strategic planning.

Over the centuries of Chinese history, Qi Men Dun Jia grew in popularity and was expanded to include a number of other types of divination, including medical divination, matchmaking

Matchmaking

Matchmaking is any process of matching two people for the purpose of marriage or a sporting contest.-Practice:In some cultures, the role of the matchmaker was and is quite professionalized...

, childbirth

Childbirth

Childbirth is the culmination of a human pregnancy or gestation period with the birth of one or more newborn infants from a woman's uterus...

, travel

Travel

Travel is the movement of people or objects between relatively distant geographical locations. 'Travel' can also include relatively short stays between successive movements.-Etymology:...

, personal fortunes, and today includes contemporary applications, most notably, that of business and finance.