CS1 Course Site       Compilation of Powerful Ideas ( Cognitive and Computational ) Top 10 list of Powerful Ideas Object-Oriented programming   Object-Oriented programming is a style of programming which features the modelling of objects in a hierarchical fashion and the sending of messages to appropriately behaving objects. This is an extreamly powerful idea sinse without it our programs would be very cluttered,  extreamly large becausse of all the additional code we would have to write,  take forever to complete,  and be quite difficult.