International order has seen constant changes through the time of history. There are several factors that contributed to those changes. Together with those changes the evolution of diplomacy took place. The most significant one was the technological innovations which led to faster communication. What in its own term led to transparency and multilateral relations. The other important change is the performance of diplomacy. If before it was only the educated elite and the nobility, people of high classes of societies like in the times of Renaissance and French diplomacy today there is a notion of public diplomacy involving more International organisations and non-governmental organisations.
The world becoming more and more interdependent and it does not involve only the trading issues as it was during the times of colonisation. Hence that broadens the spectrum of diplomacy from purely state interest to tackling the issues as the global pollution, global war on terror , spread of diseases and etc. There are issues that need to be tackled and where states fail to reach as a sovereign but the international organisations has the ability to do so as for instance humanitarian organisations like Medicines Sans Fronteriers (Doctors without borders ), IMF and World Bank.
The involvement of those actors in international relations transforms the nature of old exclusive and secretive diplomacy as in the times of the Cold War to a more open and inclusive as during the United Nations summits' today. However it does not mean that the features of old diplomacy are not any more in practice. Public diplomacy has become a new feature as a consequence of industrial and developed societies.