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In page Euroscepticism:

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There can be considered to be several different types of Eurosceptic thought, which differ in the extent to which adherents reject integration between member states of the EU and in their reasons for doing so. Aleks Szczerbiak and Paul Taggart described two of these as hard and soft Euroscepticism.[1][2][3][4][5] At the same time, some scholars have said that there is no clear line between the presumed hard and soft Euroscepticism.[citation needed] Cas Mudde and Petr Kopecky have said that if the demarcation line is the number of and which policies a party opposes, then the question arises of how many must a party oppose and which ones should a party oppose that makes them hard Eurosceptic instead of soft.[6]