Nowadays in the field of defense, countries are dealing with problems involving upgrade or replacement of the main battle tanks, which leads to increase of their offensive and defensive power of heavy armor. Countries mainly use two improvement methods for their main battle tanks, the first one being upgrade of existing ones in terms of new armor, better armament, improved planning systems, improvement of the defense system of the vehicle, etc. and the second one being country's decision to buy new generation armed system. Therefore it is necessary to describe when the main battle tank is considered to be upgraded or being new generation, but at the same time the question arises “which of the options are chosen by the countries”. Research is focusing on this field since the end of the Second World War to this today. Such an extensive period is worth exploring because, of the emergence of newer generations of battle tanks which were upgraded or replaced the older generations.
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