negative engineering is making sure that if this fails, things that depend on it do not run. Logging is a big one, just having a place where you can see some centralized set of imported logs et in all the more ue lie cooper and eddies are more like, you kid of a distributed system, micro service it out, the harder it is to know what's going on. And cellaboration, versioning,. Those are all other things, cashing. So just configurable like storage locations for things.