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Figure 14
Schematic overview of how processes are linked to form a process tree structure.
In this case unit processes are used that describe a single process step,
which provides the highest transparency.
Process records can both describe unit processes, which describe one single
process step as well as systems, which describe a combination of unit processes.
For optimal transparency, it is always better to describe a system as unit
processes. However, LCI data are very often published as systems instead of
unit processes.
Later we will describe how processes are linked to product stages and how end
of life scenarios can be described.
Figure 15
An example of a product stage, in this case the life cycle.
The life cycle links the product specification (the assembly)
with the use processes and the end of life scenario
SimaPro 5.1
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