The impact of picker human error on warehouse quality parameters and inventory accuracy. Structure: 1)??Thesis introduction. Description of the work environment. Problems, objectives and solutions of the project. Preamble of thesis structure. 2)??Amazon and Internship introduction. Company description and introduction to the internship activities, ICQA department inventory control and quality management in the site. 3)??Project criticalities. Definition of Putback, Amnesty and Pickshort error; study of picker human error and data analysis regarding old performances of defective rate. 4)??Implemented actions in order to improve associates performances. Preventive and corrective actions to reduce the putback error impact on the disorder of virtual inventory.