Ikea has pioneered so much within service design (design beyond the actual product). The in-store journey, the self-assembly, the assembly instructions, clear naming, clear product display, in-store restaurant experience. The list goes on.
After Ingvar Kamprad retired, he continued travelling the world to do store inspections. Full-day walkthroughs that started in the morning at the loading bay and continued throughout the store. Everything was inspected and a list of follow-up actions was created for the store manager.