The Sensitivity (sens) interface (), found under the Mathematics>Optimization and Sensitivity () branch when adding a physics interface, provides tools for adding advanced sensitivity evaluation to a stationary model. Basic problems defined only in terms of global scalar objective functions and model parameters can be set up directly in a Sensitivity study step and therefore do not require the use of a Sensitivity interface.

The following nodes are available from the Sensitivity ribbon toolbar (Windows users), Sensitivity context menu (Mac or Linux users), or by right-clicking to access the context menu (all users).

The main Settings window for the Sensitivity node contains the following section:

The Label is the default physics interface name.

The Name is used primarily as a scope prefix for variables defined by the physics interface. Refer to such physics interface variables in expressions using the pattern <name>.<variable_name>. In order to distinguish between variables belonging to different physics interfaces, the name string must be unique. Only letters, numbers, and underscores (_) are permitted in the Name field. The first character must be a letter.

The default Name (for the first physics interface in the model) is sens.