The application of ecological modeling can demonstrate robust, objective, and transparent biological analysis. The Austin Ecological Service Field Office has a multitude of challenging Species Status Assessments (SSA) to complete to support upcoming ESA classification decisions. Previously the Service has invested in development and use of a range of quantitative analytical tools to use in population analysis for SSAs culminating in a recent training class, Species Status Assessment 200 – Strategic use of data: describing population trends for Species Status Assessments. We now seek to apply these tools for more generalized use for a variety of species situations. With this proposed research, population-modeling theory will be applied to employ tools for modeling species with significant uncertainty about their population dynamics and future trajectories. We will develop, apply, and communicate these tools in ways that are understood and applicable by both SSA teams and Service managers responsible for ESA classification recommendations. The objectives of this project are to 1. employ generalizable tools or modeling frameworks for assessing species status to inform or support endangered species decision making and management, 2. develop population viability models in support of Austin Office SSA teams for one or more upcoming Austin Office SSAs, and 3. coach and educate U.S. Fish and Wildlife Service biologists on SSA teams on how to apply population modeling concepts and techniques into analytical processes.