Abstract: The disclosure relates to analyzing and visualizing flows in a supply chain context for the purpose of inventory optimization. Embodiments disclosed include a method of analyzing a process flow in a supply chain context, the method comprising: inputting (3402) a first set of data to an application residing on a processor, relating to products, locations and supply routes connecting the different locations in the supply chain; the application generating (3403) from the first set of data an input data array; inputting (3404) a second set of data relating to measured and forecast flows of products through the supply chain over a defined time period; the application calculating (3405) from the data a series of measures of operation of the supply chain; and, based on one or more of the measures being outside a predefined range, the application generating (3406) an output indicating recommendations for adjusting operation of the supply chain.