Properties of the Steady-State RGA

The following properties are especially noteworthy when working with the RGA  

In such systems, the process interaction is in one direction only, and therefore precludes the possibility of the occurrence of destabilizing feedback. 

the dynamic RGA (DRGA) has precisely the same form as the steady-state array. Note that the dynamic RGA assumes perfect control, which may not be an appropriate assumption, especially at high frequencies. The computation of the DRGA requires care since it involves complex algebra. Because columns and rows sum to unity only at the steady state, the DRGA should be computed using 

An accepted rule of thumb is to avoid pairings between variables with negative RGA elements and to select those with values close to unity, as illustrated in the following example. 

Using the property that the RGA rows and columns add to unity, 

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