The intertwinement of EC law and national law may create unforeseeability in situations where EC law invades the national cases, which gives rise to the very question of legal certainty in EC law. This study contributes to the contemporary discussion, which wrestles with the following questions in particular: Legal certainty relates to the principle of non-retroactivity and the protection of legitimate expectations in particular, but more profoundly it can be related to the conceptual scale for weighing up and balancing between formal justice and material fairness in legal decision-making. This scale is illustrated by presenting the terms 'formal', 'factual' and 'substantive' legal certainty. weiterlesen