Resource efficiency means obtaining useful outcomes while avoiding unnecessary consumption and losses. A material-flow view follows what enters a process, what becomes useful output and what leaves as waste, emissions or other losses.
Define the process boundary
Choose a boundary that people can understand: a workshop, production line, building or service. Identify the main inputs, such as purchased material, packaging, water and energy. Record useful outputs and the other destinations of those inputs.
Start with a manageable period. Purchasing records, stock changes and waste records may use different dates and units. A comparison is only meaningful when the boundary and units are consistent.
Question why waste occurs
Offcuts, damaged stock, excess packaging and discarded products have different causes. Waste may result from design choices, procurement specifications, setup errors, storage conditions or demand uncertainty.
Preventing the loss can save the material and the effort used to purchase, handle and process it. Recycling may recover some value but does not automatically address the original cause. Evaluate reuse or recovery options against safety, environmental consequences and applicable rules.
Use absolute and intensity measures together
An absolute measure reports total consumption or waste. An intensity measure relates that amount to an appropriate activity, such as tonnes of product or occupied floor area.
Suppose a fictional process uses 120 tonnes of material to produce 100 tonnes of saleable output. A simple output-to-input ratio is about 83%. That figure does not explain where the remaining material went. Stock changes, moisture, by-products and measurement error may all matter.
Record assumptions and avoid describing a calculation as a complete environmental assessment. The performance indicators guide explains why a single ratio rarely tells the whole story.
Connect decisions across the life cycle
A lighter package might reduce transport weight while increasing damage. A reusable item might require cleaning and return transport. Consider the environmental aspects of the options, including effects outside the immediate site.
Use the environmental management system to assign actions, check the results and keep improvements in place. Resource efficiency is an ongoing operational discipline rather than a one-off waste audit.