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and still are, advocated. In this way, we hope to circumvent the
fundamental barriers to move to a circular economy.
The key drivers and preconditions playing a role in the three
product chains can be visualised in a similar manner. It turns out
that in all three cases, the key drivers are roughly comparable to
the aforementioned drivers. The preconditions are more casespecific.
For example, the main preconditions in the concrete case
are: 1) development of adequate tools and procedures applicable
for everyone; 2) adjustment of quality norms and standards; 3)
knowledge transfer and training of new methods and innovations;
4) new ways of working on the shop floor; and 5) adaption of
resource stream collection and logistics. In the other product
chains we also found another customised set of preconditions.