This assignment provides a comprehensive analysis of various concepts related to operation management, including online retail returns management, bandwidth management, and public transport planning. It also explores the integration of value stream mapping and discrete events simulation as decision-making tools in operation management. Additionally, it discusses the effects of firm size and sales growth rate on inventory turnover performance in the US retail sector. The assignment includes a review of relevant patents and publications, such as U.S. Patent 9,878,786 and International Journal of Physical Distribution & Logistics Management.