Disagreeing with someone senior

Correcting a boss, teacher or elder in front of others can make them lose face, even if you are right, and that cost will land on you. The workable route is ไว้หน้า: raise concerns privately, before or after the meeting, as questions rather than corrections. Phrases such as ขอแย้งนิดนึง, ไม่ทราบว่า… and ขอตั้งข้อสังเกต give your point without a challenge. Offer data, then let the senior person announce the change as their own decision. Never back anyone จนมุม in public: a cornered person must defend themselves, not reconsider. In many modern Thai workplaces juniors speak up more freely, so watch how your colleagues do it and match their level.