The Committee for Labour and Social Affairs of the German Bundestag held a public hearing on 14 September 2020, which, among other things, heard two motions from the parliamentary group DIE LINKE. (BT-Drs. 19/17134) and the parliamentary group BÜNDNIS 90/DIE GRÜNEN (BT-Drs. 19/20585) on working time law. As an individual expert, Dr. Klein was consulted in particular on the judgment of the European Court of Justice of 14 May 2019 in Case C 55/18 Federación de Servicios de Comisiones Obreras (CCOO) v Deutsche Bank SAE, on which he had already published together with Dominik Leist (Die unionsrechtliche Pflicht zur Arbeitszeiterfassung, in: ZESAR 2019, p. 365-372; EU law requires working time recording: Consequences of the ECJ-ruling in the case 'CCOO' for member states and especially Germany, Dispatch No. 19 des Comparative Labor Law & Policy Journal). Dr. Klein presented to the Committee his view that there is an immediate need for legislative action as a result of the ruling in Germany. Prior to the hearing, Dr. Klein had already explained in a written statement (Ausschussdrucksache 19(11)746) the individual legal framework conditions under Union law to be observed.