1.1 ,This guide covers an approach to identification, selection, and use of ecological endpoints (both assessment and measurement endpoints) (1-8)² that are susceptible to the direct and indirect effects of both chemical and non-chemical stressors or agents associated with wastes and contaminated media at specific sites under current and future land uses. It does not address assessment and measurement endpoints for non-site specific studies (for example, chemical-specific or regional risk assessments) or measurements in abiotic media (soil, water, or air).