Hamadi, D., Sadki, A. and Gattaf, M. 2020. The ISO 9000 system theorization approach, practice process and Perspectives for success content analysis for top managers visions DML Laghouat . Dirassat Journal Economic Issue. 11, 2 (Jun. 2020), 161-178. DOI:https://doi.org/10.34118/djei.v11i2.733.