Page 179 - Materials Chemistry, Second Edition

Part 2b: Operational annex 165

REQUIREMENTS FOR DOCUMENTING AND JUSTIFYING NEW IMPACT CATEGORIES
If another category indicator, model or characterisation factor is used than those recommended as best
available practice in this Guide, the following requirements shall be comprehensively and transparently
documented and justified.
Table 4.3.4: Requirements for documenting and justifying new impact categories.
ISO starting points WIA–2 selection criteria for baseline
starting points method recommended in
this Guide
1. the category indicator should included included
(shall for comparative
assertions) be modeled in a
scientifically and technically
valid way in relation to the
environmental interventions,
i.e., using a distinct identifiable
environmental mechanism
and/or reproducible empirical
observation
2. the category indicators and included included
models shall be
environmentally relevant, i.e.
shall be sufficiently clearly
related to the category
endpoints, at least qualitatively
3. the category indicators and not explicitly included included
models should be
internationally accepted, i.e.
based on an international
agreement or approved by a
competent international body
4. value-choices and included included
assumptions should be
minimised
5. category indicators can be included included
chosen anywhere in the
environmental mechanism of
an impact category, from
environmental interventions to
category endpoints (focal point
in environmental mechanism)
6. not included it should be possible to multiply modified:
characterisation factors by mass the baseline category indicators
or other units indicating the should be linear (linearity)
magnitude of the environmental
interventions
7. not included the preferred time span for fate included
and effects is eternity, with 100
years as a second option; all
effects of the emission/
extraction occurring now and in
the future should be taken into
account
8. not included the category indicators and included
models should include the
modeling of fate, exposure and
effects, as relevant
9. not included the category indicators and included
models should include effects
below thresholds (“less is
better”approach)