The model system was divided into six subsystems.
For the packaging and household subsystems, alternative
scenarios were analysed. Table 1 shows a summary of
the subsystems, the processes they include and the scenarios
investigated. For the packaging subsystem, the
waste management scenarios investigated are further
defined in Table 2.
allocation applied are shown in Table 3. Our ambition
was to use site-specific inventory data, whenever possible.
To collect this data and other information, we used
our own questionnaire, interviews and environmental
reports. The Swedish producer of ketchup has several
suppliers of tomato paste in Italy, Spain and Portugal;
the inventory data for tomato paste were collected from
one of the suppliers in Italy. The data for cultivation of
tomatoes were collected from one of the farms supplying
the Italian tomato paste plant. Most of the inventory data
were collected in 1993 and 1994.