1) Negotiation involves factors like power, concessions, leverage, resources, and attitude.
2) Case 1 describes a negotiation between Mark and Tom over the sale of a car, where identifying their best alternative to a negotiated agreement (BATNA) is important to the negotiation.
3) Case 2 describes a negotiation between an employee and HR department over compensation level and salary, where approaching with honesty and understanding led to a 25% increase in the initial offer.