# General commands
:;<h2>reliability Command</h2>
-
This command creates the reliability domain in which the sensitivity,
reliability and optimization components are kept. This
-
reliability domain is parallel to the finite element (FE) domain in
OpenSees. Currently, the commands for stand-alone sensitivity : analysis
(e.g., sensitivityIntegrator, sensitivityAlgorithm) are set in the
reliability domain only and, thus, the ‘reliability’
```tcl
reliability
```
:;<h2>parameter Command</h2>
-
In DDM-based FE response sensitivity analysis, the sensitivity
parameters can be material,
-
geometry or discrete loading parameters. Each parameter should be
defined as:
```tcl
parameter $tag <specific object
arguments>
```