“…However, the rigorous definitions and determination methods of 21CSs have not been introduced yet (Agaoglu & Demir, 2020;Barasi & Erdamar, 2021;Cansoy, 2018;Eryilmaz & Uluyol, 2015;Geisinger, 2016;Yavuz et al, 2020). Different scientists (Atalay & Anagun, 2016;Kan'An, 2018;Lemke, 2002;Osman et al, 2010;Vilia & Candeias, 2020;Yavuz et al, 2020;Zorlu & Zorlu, 2021) and some organizations such as International Society for Technology in Education (ISTE), World Economic Forum (WEF), Assessment and Teaching of 21st-Century Skills Framework (ATSC21), Partnership for 21 st -Century Skills (P21), The North Central Regional Educational Laboratory (NCREL), American Association of Colleges and Universities (AACU), and METIRI Group have tried to define 21CSs and their assessment rules (Cansoy, 2018). Lemke (2002) has defined 21CSs in four main categories as; IT, EC, HP, and DAL in the project supported by NCREL and METIRI Group.…”