ISO Certification is actually a good thing because it's meant to mean your facility meets a specific quality standard and generally makes you more attractive to customers because of it.

I've been through a lean manufacturing class as part of my college program, as well as a handful of lean events at GE as one of the shop dudes they pull in to ask process questions to.

They threw out fixture pieces we actually needed to run some of the lower volume operations, they'd ask for feedback from me as well as my coworkers and then completely disregard it, move our workstations all over the fucking place trying to designate them for specific things in a section that doesn't really work that way.

Inside a month we basically get everything back to how we as a section want it and flow best with the entire time morale and productivity craters because everyone's pissed about their shit being moved around or thrown out entirely, being asked feedback and then having it ignored. Shit the last one they moved our work benches to the complete opposite side of the shop from our in and out racks so we had no idea when work would show up.

About the only GOOD thing that comes out of these has been the updates to the work instructions because they pour a bunch of extra resources into fixing quality and safety concerns during them.