ifu Hamburg GmbH is a software maker with a track record of 20 years in implementation of software tools in the sustainability field. We are specialized in applications that support corporate environmental tasks, such as Material and Energy Flow Analysis, Material Flow Management, Resource Efficiency, Material Efficiency, Energy Efficiency, Life Cycle Assessment (LCA) and Carbon Footprinting. Our customers are practitioners from industry, engineers in consulting firms, and researchers. Our standard software tool 'Umberto - know the flow' (http://www.umberto.de) is used for material and energy flow analysis, flow cost accounting and process optimisation. Our tool 'e!Sankey - show the flow' (http://www.e.sankey.com) is the leading software for visualization of material, energy and cost flows with so-called Sankey diagrams. It is used worldwide in more than 80 countries. ifu also develops bespoke software and database applications in the fields of energy, waste management, waste water. We offer consultancy services for material flow analysis, sustainable production and resource efficiency. We enable sustainable production!