Siete eslabones detrás de un teléfono

The result is a chain of seven links: data schema, migration, logic, connections to other programs, permissions, screens, checks. The administrator’s small request touched all seven, and the change the agent made touched two. Any new capability in a program, even the most modest, changes a connected network in which every link is tied to its neighbours, and to change one link without looking at the others is to leave a breakage that will show up later and somewhere else.