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Introduction: The introduction aims to provide a background to the problem in manufacturing companies in terms of logistics and material handling. It provides a brief description of the key areas of this study.

Purpose and research question: The purpose of the study is to investigate the internal material supply flow in a manual assembly line. This is accomplished by identifying potential Lean concepts in the material flow for reduced waste and more efficient work. Based on the purpose of the study, two issues were formulated to solve these problems:

RQ1: What wastes are present in the material supply flow?

RQ2: How can wastes be reduced to increase the efficiency of the material supply flow?

Approach and method: A case study was conducted at a producing company and data was collected through literature review, observations and semi- and unstructured interviews. The literature review was collected in order to link the theoretical frame of reference with the result and was obtained from scientific articles and books.

Results: A few wastes were identified at the case company, and these were waiting, unnecessary and impractical movements, as well as unused skills. There is no good material handling system at the company that contributes to the cause of some of these wastes. This creates an inefficient flow of material which in turn creates delays.

Conclusion: The conclusions that can be drawn in this study are that wastes occur on the case company's assembly line, which creates an inefficient material supply flow. Some Lean tools and concepts were introduced to be able to reduce these wastes and give the case company the opportunity to implement these to achieve an efficient material supply flow. An improvement layout was also developed to reduce waste.

Keywords: Logistics, Material supply, Lean, Wastes, Material flow