Attribution looking at the inflows and outflows. Consequential looking at what are the consequences of putting things into the system, look at what"s happens if and into the future. Socials social aspects instead of consequential and attribution which is focused on the environment. Goal and scope definition looks at the inflows and outflows the inventory is where this data is. What do we want to find out. What does all of this data mean. What are the impacts on the inventory. Slide 15 strategic plan: internal use public policy making external don"t want to get lost in your data. Slide 18 function: what does the thing do. Function unit: measure on the basis of the functional unit. Slide 21 consistent across most lca product is the primary thing something that you are producing and has value is a coproduct (has value) a byproduct has no use and is a waste.