Pyramid Principle
Lead with the conclusion, support it with grouped arguments, back those with evidence. Answer first, explain second — the structure that makes every message land with busy readers.
MECE Principle
Mutually Exclusive, Collectively Exhaustive — the structural test for any list or framework that prevents double-counting, gaps, and categories that blur into each other.
BATNA
Your Best Alternative to a Negotiated Agreement is your real walk-away point. Know it before any negotiation and you'll never accept a bad deal out of desperation.
Radical Candor
Care personally while challenging directly — the antidote to ruinous empathy (saying "looks great!" when honest feedback would actually help) and obnoxious aggression.
Nonviolent Communication (NVC)
Observation, Feelings, Needs, Request — a four-part model for expressing yourself and responding to others without blame, judgment, or demand.
Cialdini's Six Principles of Influence
Reciprocity, Commitment, Social Proof, Authority, Liking, Scarcity — the six universal principles that govern how humans are persuaded, used ethically by every effective marketer.