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Figure 6: Data Collection and Calculation Process
Figure 6 shows the process of setting up an LCI. The process of conducting an LCI is
iterative. As data is collected and more is learned about the system, data requirements or
limitations may be redefined or a change in the data collection procedures in order to
meet the goal of the study may be required. Sometimes issues may be identified that
require revisions of the goal or scope definition of the study. After all process data is
collected, an LCI table for the whole product system is created. The LCI is often presented
as a table listing of all the material and energy inputs and outputs for the system.
Detailed information on data collection and calculation can be found in the ISO 14044.
2.2.2 Data Collection - Classifications
This phase is the most work intensive and time consuming of all the phases in an LCA. It
includes collecting quantitative and qualitative data for every unit process in the system.
The data for each unit process can be classified as follows:
energy inputs
raw material inputs
ancillary inputs
other physical inputs
products
co-products
wastes
emissions to air, water and soil
other environmental aspects
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