X. Groussot, Creation, Development and Impact of the General Principles of Community Law: towards a jus commune europaeum?, Lund University, Lund, 2005, s. 16-27, klassificerer principperne i supplerende (eller subsidiære), vejledende og operationelle.
In addition, Groussot, X., Creation, Development and Impact of the General Principles of Community Law: towards a jus commune europaeum?, Lund University, Lund, 2005, pp. 16 to 27, classifies the principles as supplementary (or subsidiary), regulatory or operational.