The existence of legal security and certainty principles will pre-vent arbitrary practices in disciplinary law, which is one of the areas where legal stability and unity of implementation are important. In order to prevent the misuse of the disciplinary rules introduced for the administration to establish the administrative order and trust in the public, not only disciplinary principles should be specific and clear, but also disciplinary practices should be predictable within this frame. It is clear that disciplinary practices do not comply with the rule of law, if disciplinary rules are used against individuals with arbi-trary interpretations that will turn them into a means of repression, the absence of unity of implementation, and the ineffectiveness of legal supervision due to the abuse of discretion. For this reason, legis-lation and practices based on these principles are necessary in order to ensure certain stability in disciplinary processes and to protect the sense of trust of the individual and society.