Assessing the Critical Sources of Wastes in the Moroccan Construction Industry: An Empirical Study

The performance of construction projects worldwide is significantly impacted by the occurrence of waste; however, few studies have been carried out in this research area especially in developing countries. In this study, 24 types of waste have been identified starting from a review of previous research, and then reinforced by semi-structured interviews with Moroccan construction experts. Thereafter, a structured questionnaire was conducted to survey 330 Moroccan construction practitioners with a view to investigate the critical origins of waste in Morocco. "Activity start delays" was found to be the most significant source of waste according to the perceptions of the surveyed respondents. Furthermore, the statistical analysis revealed that the top three ranked waste categories were: 1-unused employee creativity, 2-delay and waiting, and 3-defects/errors/corrections.