[IBIS-Users] Capacitance and transition time

A coworker wants to simulate what affect connecting
different capacitors to the output pin of a device
would have on its transtion time.  He doesn't have
access to spice models and he asked me if he could use
IBIS models.  I told him that since the models are
characterized under a given load, changing that load
in simulation may not give him very accurate results. 
Was I correct, or will the simulator use the values of
the IV curves and test fixture to accurately skew the
rise and fall times specified in the VT curves?

Thanks in advance,

Mike Sachtjen

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