When measuring cognitive load, what we really care about is the domain complexity—how complex is the problem that we’re trying to solve with software? A domain is a more largely applicable concept than software size. For example, running and evolving a toolchain to support continuous delivery typically requires a fair amount of tool integration and testing. Some automation code will be needed, but orders of magnitude less than the code needed for building a customer-facing application. Domains help us think across the board and use common heuristics.
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