The starting point of any research aimed at the role of think tanks is the definition of think tank itself. This seems to be a challenging task due to the variety of different theoretical and practical approaches, differences in American and European models. The situation is getting even more complicated if taking into consideration Eastern European think tanks which have a different origin and also are functioning within the completely different environment if comparing to Western European and American think tanks. In his article Sergiy Gerasymchuk, “think twice UA” Initiative’s advisor analyses the problems of definition of think tanks and the way to solve them.