In this article, the author focused on research concerning theoretical bases, characteristics and rules of the relationship between S&T strategy, planning, plan to draw out from there a meaningful methodology. | JSTPM Vol 2, No 4, 2013 53 THE INTER-RELATIONSHIP BETWEEN STRATEGY, PLANNING, PLAN IN THE FIELD OF SCIENCE AND TECHNOLOGY Nguyen Viet Hoa National Institute for Science and Technology Policy and Strategy Studies Abstract Science and technology (S&T) strategy, planning, plan are always inter-related in respect of legislation, interaction, dependency and complementary to each other. They are intentionally formulated based on planned ideas. During the development of S&T policy, policy-makers always try to create a sustainable relationship among them, but to do that, there exist many difficulties encountered in reality. In this article, the author focused on research concerning theoretical bases, characteristics and rules of the relationship between S&T strategy, planning, plan to draw out from there a meaningful methodology. Keywords: Science and Technology Strategy; Science and Technology Planning; Science and Technology Plan. Code: 13090303 1. Theoretical bases of the relationship between science and technology strategy, planning, plan . Theoretical bases The term "strategy" has so far been confirmed by many studies that it derived from military field and it means the way how to win in a war. The term was created in the ancient Greece and then be applied in many fields and now is still used and continuously further developed. The terms "planning" and "plan" were launched later than “strategy” term but they have been utilized in many areas/sectors. To date, the question of when all of these three terms were first applied in the field of S&T is still controversial, many opinions believed that they appeared in the modern scientific and technological revolution started in mid-forties of the XX century. Presently, with the contemporary scientific and technological revolution in XXI century, the concept of strategy, planning, plan in the field of S&T has experienced a lot of changes. Theoretically, based mainly on the innovation theory in strategy development,