The Model Maturity Pattern provides a mechanism for assessing the maturity of a Model. This assessment may be applied to a whole Model or a specific set of Views that comprise part of the Model. The Pattern defines four Viewpoints which allow the specification of the Maturity Levels, Factors, Indicators and their associated States. The resulting Views are relatively simple being represented by block diagrams and a bar chart. This Pattern provides a useful and powerful input to MBSE Project Management activities. When combined with the Epoch Pattern that can be used to define baselines, this Pattern enables the evolution of the Model over time to be plotted. The Maturity Level Views also provide a good input into risk assessment activities for the management of the project.