hossein shakohi, the scientific secretary of this conference, is our guest to talk about the goals of holding it. and my dear countrymen, congratulations thank you very much, although we are far from the beginning of the ten dignity , but the celebrations are starting from today. the population is the authority of the system , it creates and provides the economic, social and military growth of any country, even the youth of the population can be effective in the security of the country and any kind of shortfall is made in increasing the youth of the population. it will cause irreparable damage to the countries. today we see that the most populous and powerful countries are the most countries in the world. the islamic republic of iran has gone through three periods of population policy in the country : a population reduction policy from the beginning of the islamic revolution to the mid-1960s, a population threat policy from the mid-1960s to the early 1990s, and a policy to put aside that population threat from the beginning of the decade. from 1990 onwards, the best years in which the