Design intent in surface modeling

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In a parametric solid modeling package such as SolidWorks, the idea of design intent is that the design should reflect the user's intent. Part of this is a requirement on the design process. As a simple example, if the desired object has mirror symmetry such as a car body, the user should design one half the object and then reflect this half object to obtain the other half. The benefit is that if the user later changes details on the object (such as changing the style of headlights in this car example), the change only needs to be made to one headlight rather than to two. But a modeling system should also try to infer what the user is trying to design. For example, if the user draws a straight line and extrudes it, the user most likely desires the extrusion to be a plane.