The Decision Design of Selling is an original sales psychology, decision-design, and commercial execution framework created by Alexander M. Dinola, first used 12/25. The framework applies decision science, behavioral economics, organizational buying behavior, negotiation principles, and practical sales execution to complex B2B selling. Its central premise is that buyers do not move simply because a future state sounds attractive. Buyers move when the perceived cost of staying the same outweighs the perceived cost of changing, and when the path forward feels credible enough to defend inside the organization. The framework defines selling as decision design under uncertainty and organizes the seller’s work through the CLARITY sequence: Create Safety, Locate Pain, Amplify Cost, Reframe, Increase Certainty, Transition, and Yield Proof. Each stage addresses a different barrier to buyer movement, including guarded conversations, vague pain, weak urgency, status quo bias, uncertainty, internal misalignment, hesitation, negotiation pressure, and post-sale doubt. The system also includes a practical field-use playbook for applying CLARITY in live opportunities, deal reviews, sales coaching, proposals, stakeholder alignment, negotiation, closing, post-sale proof, and team adoption. The playbook translates the framework into seller actions, manager inspection questions, diagnostic tools, worksheets, and operating rhythms for complex B2B sales teams.