Constrains an object so that its scaling factor is the same as that of the constraining object. If, for example, the constraining object is scaled down to 50% of its original size, the constrained object is scaled down to half its own size as well.
For more information, see Scale Constraints [ Animation ].
To apply: Select an object, Constrain Scaling, then pick the object to which the selected object will be constrained.
To redisplay: Select the constrained object, choose Explore Constraints on the MCP, and click the constraint's icon.