Ford $F -0.22%, Commonwealth Bank of Australia, and IBM $IBM +4.26% have each moved to bring back human workers after discovering that artificial intelligence systems could not fully replace the roles they had eliminated, according to CNBC.

Ford spent the past three years hiring 350 veteran engineers to address vehicle quality problems that automated systems had failed to catch. Charles Poon, Ford's vice president of vehicle hardware engineering, said the company had wrongly assumed that feeding AI its design requirements would produce a high-quality product without experienced human oversight. The returning engineers have overhauled the AI tools and now lead troubleshooting sessions, and CEO Jim Farley said the effort has generated hundreds of millions of dollars in savings from declining warranty and recall expenses. READ MORE