Ecosystem health is deteriorating in many parts of the world due to direct and indirect anthropogenic pressures. Generating accurate, useful, and impactful models of past, current, and future states of ecosystem structure and function is a complex endeavor that often requires vast amounts of data from multiple sources and knowledge from…

This hearing, which is the first of a series of hearings on the 1990 decennial census, focuses on automation activities, pretest preparations, and proposed residency rules. Gene L. Dodaro, associate director of the General Accounting Office, calls on the committee to use special purpose tests to adequately evaluate the following: (1) potential of…