Scale actions resize selected objects relative to the base point specified by the action.
Apply a Scale Action to a Linear Parameter
A scale action applied to a linear parameter scales the selected objects in the direction of the parameter.
Apply a Scale Action to a Polar Parameter
A scale action applied to a polar parameter scales the selected objects by the specified distance and angle. While the resulting geometry behaves in the same way as a scale action applied to a linear parameter, the way the grips are manipulated is different in the Properties palette.
Apply a Scale Action to an XY Parameter
A scale action applied to an XY parameter scales the selected objects only in the X and Y direction specified by the parameter. While the resulting geometry behaves in the same way as a scale action applied to a linear parameter, the way the grips are manipulated is different in the Properties palette.