What is the Berlin Process for the Western Balkans?

The term “Western Balkans” is used for six countries in southeastern Europe: Albania, Bosnia-Herzegovina, Kosovo, Montenegro, North Macedonia and Serbia. Although none of them are members of the EU, they all aspire to be part of the European family. 
In 2014, a platform called The Berlin Process for the Western Balkans was launched in the German capital with the aim of helping these countries move closer to the EU. 
Every year, representatives of the Western Balkan countries, the Berlin Process host countries and the EU come together for a number of meetings in a different European city to discuss a wide range of subjects including, among others, the economy, security, the environment and mobility. 
On October 14, the platform will celebrate its tenth anniversary in Berlin. A decade on, what has been achieved by the Berlin Process? And what hasn’t?