 Unless you have a mind like a steel trap, you'll need a way to keep track of it all. One of the most popular software systems for managing inventory is QuickBooks, but there are others as well. He explains why you should invest the time and money in a computer program. What I have found in my research is that inventory is complex and it's way too much for us to remember. That's point blank. And there are so many steps to integrate your inventory value, your ordering process, your pipeline and supply chain management to do it all by memory.