Purpose – The study aims to examine why material waste is generated in a production process in the corrugated cardboard industry and identify the products that cause the most waste, and how the classification can be used as a basis for addressing these wastes. Metholodgy – To meet the purpose of the report, a case study has been conducted in collaboration with Stora Enso Packaging AB in Jönköping. The authors first created a theoretical framework that was continously compared and analyzed with the empirical data gathered through observations, interviews and document studies. The empirical data has generated an analysis and discussion of the study's main area. Background – Material waste is a form of waste in the corrugated board industry which creates unnecessary costs in the material flow. These costs are part of what is called quality costs, costs that are estimated at 10-30% of the company's revenue in the Swedish industries. Findings – Based on empirical data collected and studied literature the authors have identified three main reasons why material waste occurs in a production process of the corrugated board industry. The three reasons are; lack of standardized work, lack of internal communication and the lack of quality controls of raw materials. The findings also present how product classification can be used identify the products which causes the most material waste. Conclusions – The authors believe that the main reason behind a lot of the material waste that occurs in the studied process is its varying input. Various grades of raw materials and various settings of the machine makes it difficult to achieve a stable process, which leads to the occurance of material waste. Implications – The identified material waste and its cause is only designed for a corrugated board industry and the shortcomings that the properties of a typical process industry contributes to. The report is based on a case study in the corrugated board industry and could be generalized to most businesses within the same segment. The work, however, may have to be adapted for other activities depending on varying conditions. Keywords – Corrugated cardboard industry, process industry, material waste, ABC analysis,,fishbone,diagram.