The Services have defined adverse modification as “a diminishment of critical habitat that leads to a lower likelihood of survival and recovery for a listed species.” The diminishment may be direct or indirect. To assess the likelihood of adverse modification, biologists will first verify the scope of the proposed action. This includes identifying the area likely to be affected and considering the proximity of the action to species or designated critical habitat. The duration and frequency of any disturbance to the species or its habitat is also assessed.