Complex: consisting of many different and connected parts. Complicated: consisting of many interconnecting parts or elements; intricate. Nothing specifically

Complex: consisting of many different and connected parts. Complicated: consisting of many interconnecting parts or elements; intricate. Nothing specifically artificial about either one. Software that is well decomposed is Complex (made of many smaller connected parts). Software that is is poorly decomposed is Complicated (made of many smaller interconnected parts). Connected vs interconnected? Interconnected: connected at multiple points or levels (aka spaghetti code)