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*Coupled constraints* and restraints may be modeled within {new-tab-link:http://www.csiberkeley.com/}CSI{new-tab-link} Software, though precaution should be taken to avoid the [numerical problems|kb:Numerical problems] which may result. To successfully model coupling behavior, multiple joints should be connected using a [constraint|kb:Constraint], then [sufficiently stiff|kb:Rigid behavior] objects should connect pairs of joints to the assembly of constraints.


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*Related Incident:*
* {incident:no=23987|comment=Fixed link connected to fixed restraints results in zero reactions in moving load analysis. See 5/29/2010 action.}
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h2. Is there an example of how constraint coupling may cause numerical instability?

*Answer:* {open-question}
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