“…They showed that these different indicators are designed based on different research tradition and from scientists from different disciplines (e.g., Sociology, Political Science, Economics), and are, thus, quite diverse. They vary regarding the number of indicators (from six to over one hundred) [ 21 , 22 ], the focus of the indicators (work quality, employment quality) [ 23 , 24 , 25 ], the design (cross-sectional, longitudinal) [ 21 , 26 , 27 , 28 ]. Further, Muñoz de Bustillo et al [ 19 ], as well as Cazes et al [ 20 ] presented a more extensive summary of the major national and international frameworks, for example from the European Commission [ 29 ], UNICE [ 30 ], Leschke et al (ETUI) [ 23 ], EMCO [ 31 ], ILO [ 32 ], Eurofound [ 4 , 33 ], and UNECE [ 34 ].…”