This thesis describes the development of a knowledge-based system to evaluate forested land for availability of wildlife habitat. NED is an acronym derived from Northeast Decision Model. The NED DSS, a collection of software products, was created to help resource managers to build up goals, access current and potential conditions, and create long-term, landscape-level management plans for forest properties in the eastern United States. An initial version of NED had been released, which achieved only part of the functions we hope eventually to capture in NED. Throughout this thesis, I will focus on the wildlife component of NED and its successors. I will describe the weakness of first version in four aspects: 1) intelligent module manager, 2) data management, 3) reporting utility, and 4) knowledge representation. Then, I will discuss how we implement solutions to these problems.