What are the benefits of object modeling?

Please explain in detail as much as possible, thank you for any help you give and god bless you. Please please please someone help me out with this question, I just need a short writing of the benefits of object modeling, I really need this badly for my paper in class and my grade depends on it. I'm asking for help on here cause I can't find any info on the web so please can someone help me out!!!!!!!

Object modeling makes computer code reuseable. That also means users learn to manipulate the object because it always works the same way. For example a calendar object could be used in many different projects by just setting the properties or the MS Common Dialog object makes it easy to find files on the machine because it is used in most software that requires file navigation like Open, Save, Save As etc. If not for the object model, users would have to re-learn that process for every program they use.