Business constraints
The core you can't replace, the regulator, data residency, the two-week close: your non-negotiables are the design input, not friction to price around. This is where we say what not to build, and why.
This chapter will show how those constraints enter the drawing: the core that stays, the regulator’s rules, where your data may live, and the calendar you close on, each set on your Blueprint next to the parts of the pattern it shapes. Working through yours is the first thing the Software Review does.