It is now a policy requirement that "traditional ecological knowledge" (TEK
) be incorporated into environmental assessment and resource management in
the North. However, there is little common understanding about what TEK is,
and no guidance on how to implement the policy in public arenas where know
ledge claims must be tested. The problems are inconsistent and unclear defi
nitions of TEK, and insufficient attention to appropriate methods of organi
zing and presenting it for assessment and management purposes. TEK can be c
lassified as knowledge about the environment, knowledge about the use of th
e environment, values about the environment, and the knowledge system itsel
f. All categories are required for environmental assessment, but each must
be presented and examined differently. TEK and "Western" science provide pa
rtially different information, based on different sets of observations and
procedures, and sometimes on different knowledge claims. It is important th
at TEK be comprehensible and testable as a knowledge claim in public review
s, and usable for ongoing public monitoring and co-management processes. To
this end, certain procedures are recommended for recording, organizing, an
d presenting TEK, with particular emphasis on the need to differentiate bet
ween observation and inference or association. Documenting TEK as recommend
ed usually requires trained intermediaries, but they in turn require the su
pport and cooperation of those who have TEK. One consequence is that it is
often both impractical and inappropriate to require development proponents
to incorporate TEK into their environmental impact statements. However, the
environmental assessment process must facilitate the use of TEK in the pub
lic review phase.