The thesis will be focused on the relationship between lean management and sustainability. It was part of a project at Eiffage Energie Systèmes – Clemessy. The products concerned by the project were bio-methane injection units. The product is innovative and the activity new. We had two objectives in mind: making the Supply Chain processes more sustainable and profitable. The director appointed a pilot on the project responsible to make strategic decision to make it happen. First, we had to hunt for waste (muda) especially limiting overstocks & unnecessary foreign sourcing, which means we have to see a practical case of how Lean Management tools were used (alongside the course of Production planning and logistics at PoliTo).