Research on the sugar industry value chain has been mainly focused on logistical opportunities and primarily upstream of the milling sector. Recent research has begun to address opportunities in information transparency, collective participation, value sharing and payment incentives. Because of co-product developments, some millers tend to integrate their payment system with the supply management. In practice, implementing such modifications requires technical solutions, economic assessments and collective participation of millers and growers. This poster presents COMPA software which aims at investigating economic impacts on the sugarcane value chain of new supply planning and new cane payment systems, both for sugar and co-products. It couples two existing tools: MAGI®, assessing the impact of new supply chain management on global value production, and PEMPA®, assessing the impact of new cane payment systems on growers' revenue and on revenue sharing between stakeholders. Therefore, the resulting tool provides a quick and reliable way for assessing and comparing alternative scenarios and, thus, improves relationships between grower and miller representatives on the impact of potential changes. The scenario outputs are compared on the basis of total chain production, individual revenue and value sharing.