Evolving big systems requires big thoughts.
As we reach the Portfolio level of the Big Picture (see Figure 20-1), the things we need to describe get bigger and more complex, so in order to keep our thinking crisp, we’ll need to discuss them at a higher level of abstraction.
Figure 20-1. The Portfolio level of the Big Picture
At this level, we’ll need to understand the strategic investment themes that drive our decisions and resource allocations, the portfolio backlog (where new products, services, and systems arise), and the epics that we’ll use to define, ...