Digital sovereignty-European Union's action plan needs a common understanding to succeed

In the states of the European Union (EU), the question currently raised is to what extent dependence on technologies from the USA and China will have a lasting impact on state sovereignty. The concept of digital sovereignty represents the EU's efforts to compensate for the deficits of the past decades caused by an inadequate positioning of Europe as a location for software and hardware development. Autocratic states use the path of digital autarky, the USA a path of liberalisation and high degrees of openness. In the EU, on the other hand, regulation, data protection and liberal values developed over centuries play a major role in the less pronounced IT development. The path of European states to more digital sovereignty has been addressed politically as an "action plan", but there is still no common understanding or definition of what digital sovereignty exactly means, where the EU and thus also an individual European state stands. There is a lack of a target and a measurable index as well as evaluated measures derived from it. The present article articulates the basis, namely the common understanding and the definition of digital sovereignty. It places the concepts of digitalisation and state sovereignty in a historical framework and locates them in the current literature, then analyses digital sovereignty as a composite term and places it in the context of current research. Finally, a definition is proposed that can serve as the basis for further research to identify an index of digital sovereignty. This definition can also become the basis for EU legislation to implement the "action plan".