 Structure-only methods both undershoot and overshoot the number and which sets of variables actually control these models, highlighting the importance of the  system dynamics in determining control.
<clarity>  Structure-only methods both undershoot and overshoot the number and which sets of variables actually control these models, highlighting the importance of the  system dynamics in determining control.
 We demonstrate that structure-only methods both undershoot and overshoot the number and which sets of variables actually control these models, highlighting the importance of the system dynamics in determining control.