The school of Persian Medicine (PM) that originated from the ancient Persian civilization was established upon the basic concept of Mizaj (temperament). According to this, each person has a unique characteristic named mizaj which is recognized and classified by his or her morphological, physiological and psychological features. In PM a person is considered to be in a healthy state when his or her mizaj keeps its balance and most of the diseases occur when the mizaj becomes imbalanced. It is believed in PM that the number of mizaj equals the number of living individuals in the world.

The Persian Medicine (PM), which is called Unani Medicine in some countries, is a school that views the world as a good and seeking discipline created by the wise and omniscient Almighty. PM consists of the sum total of all the knowledge and practices used in diagnosis, prevention and elimination in Persia from ancient times to present. It is based entirely on practical experience and observations passed down from generation to generation.

Mizaj Research Project is an international research Website which has been organized with the efforts of a number of researchers interested in the scientific development of Persian (Unani) medicine. Following the programs of this website, researchers interested in the subject of Mizaj, can get acquainted and help each other in producing appropriate documents in the field of Mizaj. It is also a platform for sharing Idea between researchers in the field of Mizaj surveys.