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1 The International Society for the Study of Individual Differences (ISSID) was founded in 1983 to foster research on individual differences in temperament, intelligence, attitudes, and abilities.
Freebase(0.00 / 0 votes)Rate this definition: Issa. The Issa are a Somali clan, a sub-clan of the Dir. Members primarily reside in Djibouti, Awdal in northwestern Somalia, as well as the Shinile Zone located in the Somali Region of Ethiopia.