In traditional Tarot, the last of the trumps is The World: the blessed completion, all things in harmony, the fulfillment of divine plan. For computing systems, the blessed completion we hope for is understanding.
Perfect apprehension of the system and its work is impossible, but better understanding is the focus of our effort. We can learn about systems in general, we can study this system in particular, and most importantly we can build systems in ways we think will help us understand them. Our end goal is the intelligible, the legible, the simple.
What are the tools for understanding you can bring to bear on your system. How can it be designed to be understood? What don’t you understand about now? What are the limits of your understanding?