Ecosystem-based management (EBM) principles are intended to protect biodiversity and ecosystem functions while providing regional long-term social and economic values. Working with Veridian Ecological Consulting and the North and Central Coast Land and Resource Management Plan (LRMP) processes, Cortex co-developed a methodology that used the representation of different old forest ecosystems as a primary indicator for the probability of maintaining coarse-filter biological diversity and function over space and time. Cortex also developed assessment tools that combined land-use plans with projections of age-class distribution by ecosystem type to predict future deviations in ecosystem state. The models included assessments of partial harvesting methods and temporal projections of the recovery of ecosystem function.