Purpose - The purpose of this research is to study the impact that the adoption of Lean manufacturing principles has on operational performance in Lebanese pharmaceutical industries, while taking into account the employees' characteristics that might affect the constructs. Design/methodology/approach - The philosophical position that was adopted in this research is the post-positivist approach. Moreover, the deductive reasoning was used throughout the paper. A quantitative method was implemented using a questionnaire that targeted some Lebanese pharmaceutical companies. Findings - The perception ...