What does "Eco Preferred Content" refer to under the Material Calculators?

For the purposes of the Green Star Materials Calculators, "Eco Preferred Content" refers only to the percentage by mass of either an entire product or the components of a product which has been certified by a third-party certification scheme recognised by the Green Building Council of Australia. These currently include:

1. Organically certified renewable products
2. FSC certified timber
3. Good Environmental Choice Australia (GECA)

Reused products (e.g. workstations, chairs, etc.) or components (e.g. tabletops) can count towards the "Eco Preferred Content" of a product, assuming relevant evidence (as stipulated in the technical manual) is available to prove that the products or components are indeed reused.