Promoting the human factor of every organization is an important component that needs to be continuously up held to build employee competencies. Ultimately, this strengthens the competitiveness and sustainability of the operations within the organization. The aim of this paper is to investigate the effects of occupational health and safety management system (OHSAS 18001-2007) and learning in organizations to building its core competencies. This case study was carried out by the Evolute web based research tool in four factories between May and August 2015. Results indicated that, the acquisition of OHSAS 18001:2007 standard improves employee work output as well as increases knowledge capacity. Thus, an appreciable level of occupational health and safety management system, practice and environment has positive employee effect and that, organizational learning can be facilitated by top management commitment and leadership. However, the need for an increase in tacit knowledge disbursement among employees was realized needed.