Decoupling can be an intellectual stretch (you don’t know how to do it). Decoupling can be a time/money stretch (you could do it, but you can’t afford to take that time just now). Decoupling can be a relationship stretch (the team has taken as much change as it can handle right now).

Dynamic coupling Represents how quanta communicate at runtime, either synchronously or asynchronously. Thus, fitness functions for these characteristics must be continuous, typically utilizing monitors.