Great question! In my opinion, a detailed cultural assessment of both parties (Buyer and Target) across different functions needs to be executed to identify what kind of cultural integration will help to prevent cultural clash. For a perfect example of what culture clash actually means, watch ‘Emily in Paris’ where a young American female struggles to understand the French culture – 2 hrs. Lunch, Office start time being 10 AM,etc. HR Due Diligence will definitely help to identify the gaps, however a strong change management, an integration team and smart Corp Communications team is necessary for avoiding cultural clash.