Inventory analysisI. a life-cycle assessment (lca) - the ________ ________ is often the most difficult part because it involves determining and quantifying all the inputs and outputs of the project under study; these might include the energy required to obtain the raw materials and process or manufacture them - the energy of transportation - the need for ancillary materials - and the pollution or waste disposal involved in the manufacturing - use - and disposal processes; the ability to recycle the material is also considered