Stand Density Management Diagrams (SDMDs) are useful simplified models of stand development, growth, and yield designed for even-aged crop planning. They present information in a format which readily illustrates the patterns of change in and interactions between density or some other measure of stocking, and several key descriptive stand parameters such as mean diameter, top height and volume. A trained user can easily distinguish, for example, the impact of density change on patterns of stand development, and explore options for stand manipulation.