Use databases to find process tree Ecoinvent has local electricity mixes for different regions, use global if nothing is there. If many suppliers take market for input of raw materials/input materials for average of all market shares. Do NOT use IFU processes for your model, use ecoinvent database. Inputs must be coming from database for real impact analysis, outputs can be defined ONLY if required, but NOT inputs. Rely on proxies, if you don’t find the plastic required, use closest possible available plastic in database and use justification.