The contribution tree is available when calculating a product system with the “Analysis” calculation option. It provides the upstream total LCI or LCIA results per tier in the product system breaking down the results into the upstream total contributions of the providing processes within each supply chain.
This is particularly interesting to analyze once the major total contributor has been identified (e.g. in the “Process results” tab).
Hint! As it is a tree loops cannot be displayed, so use the results in this tab carefully if any loop is included in your system.