They are much more implementation issues. Because polymorphism, encapsulation and inheritance are well known principles, it was necessary to discuss these points. Additional Information Objects can have a limited life. Or they can suffer of wear and tear. This will decrease its strength.
Risks exists for an object to be broken.
Objects may emit sound, radiation, heat or a force and influence other objects. We must be able to develop all this kind of features. Each object can be described with a lot of meta-data like the creator, type, version, last update, security information, location, duration of life, date of next required update, validity, and so on. We notice that most important parts of the object are the attributes, states and meta-data as they contain information. Still quite important are the state transitions, as they decide what can happen with the object.