Table 2. Examples of LCA questions structured using PIFT.

P: Product or Process	I: Impact(s) of Interest	F: Flows or Economic Sectors Included	T: Type(s) of Life Cycle Assessment	Sample Question:
U.S. health care sector in 2007	Climate change	North American Industrial Classification System (NAICS) sectors	Economic input-output	What does EIOLCA using NAICS sectors tell us about the climate change impact of the U.S. Health Care sector in 2007? (Chung and Meltzer 2009)
The four major classes of U.S. mail in 2006	Total energy consumption, climate change, solid waste disposal	Paper, paper board, plastic, fuels	Process based attributional	What does attributional LCA tell us about the total energy consumption, climate change and solid waste disposal related to service for the four major classes of U.S. mail? (SLS Consulting 2008)