A huge international manufacturer of motor vehicles produces cars, trucks, motorcycles, and certain military vehicles. The parts that constitute any of these vehicles may be interchangable between the mentioned types. For example you may find that a certain engine mifht be used in either a truck or a military vehicle.

Invent attributes describing the constituent parts. Make a model that generalizes the common parts and specializes the separate parts and their sources. Hint: if brakes are a general thing, hte brake-type is a general attribute related to a brake- or parts-entity.

Draw the model and discuss the reasons behind it.

A motion picture studio produces several types of movies, some are cartoons, others are detective stories, others still are romantic melodramas. Try to identify the attributes common to movies and those separately interesting depending on type.

It is of special interest to discuss the possible overlap between the genres.

Draw an ER-diagram and discuss the prerequisites and assumptions you make.