The project objectives are: To incorporate TASS aspen yield information into the TIPSY database. This will enhance the capabilities of TIPSY as well as provide an aspen management decision tool for timber supply analysis and policy support. To summarize the best available information on the growth patterns of spruce and pine in relation to understorey light within boreal mixedwood stands. This will improve our knowledge and understanding of boreal mixedwood dynamics and support science-based management decisions. To support the development of biologically defensible growth and yield estimates for boreal mixedwoods and complex stands through the development of TASS-III understorey growth functions and, to increase awareness and knowledge of boreal mixedwood stand dynamics.