»Non-codified Rules in the German Federal Parliament. An Empirical and Systematic Legal Study of the Informal Parliament«: The thesis analyses the numerous unwritten practices, customs and habits of the German Federal Parliament, which significantly shape its organisation and procedures. Based on an empirical collection of such non-codified parliamentary rules, a phenomenological examination is carried out and - against the background of the principle of parliamentary autonomy - a proposal for their systematisation based on legal and non-legal categories is made.