The Woods Hole Assessment Model (WHAM) is a general state-space age-structured stock assessment framework developed by **Tim Miller** and **Brian Stock** from NOAA. This model is designed to include environmental effects on population processes. The state-space framework is attractive because it can estimate observation and process error, as well as naturally propagate random effect parameters in stock projections. WHAM has many similarities to ASAP (Age Structured Assessment Program) (Legault and Restrepo 1998), including the input data file structure. Currently, the stock assessment of my thesis research follows the WHAM framework.