{"site":{"title":"Mental Arsenal","description":"Your command center for switching from Autopilot (S1) to Engineering (S2). A free toolkit of thinking frameworks — and ready-to-copy AI prompts that force rigorous analysis.","lastUpdated":"2026-06-19T18:00:30.201Z","url":"https://mentalarsenal.com"},"mentalModels":[{"id":"model-double-diamond","title":"The Double Diamond (Diverge & Converge)","origin":"British Design Council (2005)","content":"The Double Diamond framework prevents wasted effort by forcing two distinct phases of 'Diverging' (going wide) and 'Converging' (selecting). Diamond 1 (The Problem): Explore root causes before defining the problem. Diamond 2 (The Solution): Brainstorm many ideas before selecting the best one.","highlight":"Most bad decisions solve the wrong problem. Apply this model first — am I solving the right problem?","bookTitle":"Change by Design","bookLink":"https://www.amazon.com/Change-Design-Revised-Updated-Transforms/dp/0062856626?tag=mentalarsen0f-20","label":"Used inside the CDR Loop"},{"id":"model-first-principles","title":"First Principles Thinking","origin":"Aristotle / Physics","content":"Reasoning by analogy ('We do it this way because it's like X') is mental shorthand. First Principles thinking requires you to strip a problem down to its fundamental truths—the laws of physics, the raw costs of materials, or the basic incentives—and build up from there. It allows you to innovate rather than just iterate on what already exists.","bookTitle":"Zero to One","bookLink":"https://www.amazon.com/Zero-One-Notes-Startups-Future/dp/0804139296?tag=mentalarsen0f-20","label":"Used inside the CDR Loop"},{"id":"model-inversion","title":"Inversion (Avoiding Stupidity)","origin":"Carl Jacobi / The Stoics","content":"Mathematician Carl Jacobi said, 'Man muss immer umkehren' (Invert, always invert). Complex problems are often hard to solve forward ('How do I win?'), but easy to solve backward ('How do I guarantee I lose?'). By identifying the exact causes of failure (stupidity, sloth, friction), you can build systems to prevent them.","bookTitle":"The Great Mental Models","bookLink":"https://www.amazon.com/Great-Mental-Models-General-Thinking/dp/1999449002?tag=mentalarsen0f-20","label":"Get the prompt"},{"id":"model-second-order","title":"Second-Order Thinking","origin":"G.K. Chesterton / Howard Marks","content":"Also known as 'Chesterton's Fence.' Everyone sees the immediate effect of an action (First Order). Few stop to calculate the consequence of the consequence (Second Order). Example: Rent control makes apartments cheaper today (1st Order), but discourages building new ones, creating a shortage tomorrow (2nd Order).","bookTitle":"The Most Important Thing","bookLink":"https://www.amazon.com/Most-Important-Thing-Uncommon-Thoughtful/dp/0231153686?tag=mentalarsen0f-20","label":"Get the prompt"},{"id":"model-pareto","title":"The Pareto Principle (80/20)","origin":"Vilfredo Pareto (1896)","content":"Discovered by economist Vilfredo Pareto when he noticed 80% of land in Italy was owned by 20% of the population. In engineering: 20% of the features drive 80% of the value. In product design: the 'practical form factor' or 'Wife Acceptance Factor' often proves vital — the technically superior solution means nothing if nobody will actually use it.","bookTitle":"The 80/20 Principle","bookLink":"https://www.amazon.com/80-20-Principle-Secret-Achieving/dp/0385491743?tag=mentalarsen0f-20","label":"Get the prompt"},{"id":"model-red-teaming","title":"Red Teaming (Stress Testing)","origin":"US Military / Cybersecurity","content":"The practice of rigorously challenging your own plans from the perspective of an adversary or failure mode. It prevents 'Confirmation Bias'—the tendency to only look for evidence that supports your idea. In the military, the Blue Team defends (builds the plan), and the Red Team attacks (finds the holes).","bookTitle":"Red Team (Micah Zenko)","bookLink":"https://www.amazon.com/Red-Team-Succeed-Thinking-Enemy/dp/0465048943?tag=mentalarsen0f-20","label":"Used inside the CDR Loop"}],"prompts":[{"id":"cdr","name":"The CDR Loop","role":"Critical Systems Engineer","label":"Constraints","tagline":"For Complex Logistics & Systems","desc":"The core engineering loop: Constraints, Double Diamond, Red Team.","promptTemplate":"Act as a Critical Systems Engineer. Analyze my plan using the CDR Framework: 1. Constraints (First Principles), 2. Double Diamond (Challenge Problem -> 3 Solutions), 3. Red Team (Find flaws). Then recommend the optimal solution.","longPromptTemplate":"Act as a Senior Systems Engineer and Critical Thought Partner.\n\nI am presenting you with a problem or a plan. Do not just answer the question or validate my ideas. Instead, process my request through the following 3-Step Framework:\n\nStep 1: First Principles Deconstruction\n- Strip away the marketing, analogies, and \"standard wisdom.\"\n- Identify the fundamental constraints (Physics, Budget, Human limitations, Technical realities).\n- Goal: Reveal what is actually true vs. what is just assumed.\n\nStep 2: The Double Diamond (Diverge)\n- Diamond 1 (The Problem): Briefly challenge my premise. Is this the right problem to solve? What is the root cause?\n- Diamond 2 (The Solutions): Generate 3 distinct, contrasting paths:\n  - Option A: The \"Standard/Easy\" Path.\n  - Option B: The \"High-Performance/Professional\" Path.\n  - Option C: The \"Lateral/Out-of-the-Box\" Path.\n\nStep 3: Red Team Attack (Adversarial Mode)\n- Ruthlessly critique your own proposed solutions from Step 2.\n- Adopt the persona of \"Murphy's Law\" or a cynical critic. Find the weak points (usability, hidden costs, failure modes).\n- Goal: Kill the weak ideas before I invest in them.\n\nFinal Output:\n- Synthesize the findings into a single \"Optimal Recommendation\" that balances the theoretical best with the practical constraints.\n\nMy Problem/Plan is: [Insert Here]","steps":[{"label":"Constraints","description":"First Principles. What is physically/financially true?"},{"label":"Double Diamond","description":"Diamond 1: Challenge the Problem. Diamond 2: Generate 3 Solutions."},{"label":"Red Team","description":"Attack your own ideas. Find the failure points."}],"description":"The core engineering loop: Constraints, Double Diamond, Red Team."},{"id":"behavioral","name":"Behavioral Architect","role":"Behavioral Strategist","label":"Emotions","tagline":"For People & Conflict","desc":"Solves human problems by analyzing incentives and environment, not just words.","promptTemplate":"Act as a Behavioral Architect. Analyze this conflict. 1. Incentive Audit (Fears/Status). 2. Double Diamond (Challenge Context -> 3 Strategies). 3. Red Team (Simulate Blowback). Recommend the optimal path.","longPromptTemplate":"Act as a Behavioral Architect and Game Theorist.\n\nI have a human/social problem. Analyze it using this 3-step framework:\n\n1. The Incentive Audit (Deconstruct):\n- Ignore what people say. Map the players.\n- Columns: Public Goal | Private Incentive | Deepest Fear.\n- Identify the \"Agent-Principal\" problems.\n\n2. The Double Diamond (Diverge):\n- Diamond 1 (The Context): Challenge the stated conflict. Is the issue actually structural or environmental?\n- Diamond 2 (The Strategies): Generate 3 distinct paths:\n  - Option A (The Diplomat): The soft, low-conflict path (Communication/Compromise).\n  - Option B (The Hard Liner): The high-conflict, boundary-setting path (Ultimatums/Rules).\n  - Option C (The Environmental Design): Change the physical/digital context so the conflict becomes impossible.\n\n3. Red Team (The Simulation):\n- Simulate the \"Blowback.\" If I choose Option B, how will they retaliate?\n- Predict the Second-Order social costs.\n\nSynthesize the specific script or action plan.\n\nMy Situation: [Insert Here]","steps":[{"label":"Emotions","description":"Deconstruct fears, status needs, and incentives."},{"label":"Double Diamond","description":"Diamond 1: Challenge Context. Diamond 2: 3 Strategies."},{"label":"Empathy Check","description":"Red Team reactions. Where is the blowback?"}],"description":"Solves human problems by analyzing incentives and environment, not just words."},{"id":"inversion","name":"Inversion","role":"Saboteur / Risk Manager","label":"Anti-Goal","tagline":"For Risk & Safety","desc":"Avoid stupidity instead of seeking brilliance. How do you guarantee failure?","promptTemplate":"Act as a Saboteur. I have a goal. 1. Define the Anti-Goal (Total Disaster). 2. List 5 steps to GUARANTEE that disaster happens. 3. Red Team: As a Risk Manager, build a defense plan against these failure modes.","longPromptTemplate":"Act as a Saboteur and Risk Manager.\n\nI have a specific goal. Instead of telling me how to achieve it, perform a \"Pre-Mortem\":\n\n1. The Anti-Goal: Imagine it is 1 year from now and I have failed exclusively. Describe the disaster.\n2. The Sabotage Manual: List the top 5 specific actions, habits, or decisions I took to GUARANTEE that failure.\n3. The Defense (Red Team): As a Security Consultant, tell me how to build specific \"Kill Switches\" or systems to prevent these exact failure modes.\n\nMy Goal is: [Insert Goal]","steps":[{"label":"Anti-Goal","description":"What does total failure look like?"},{"label":"Sabotage","description":"List the exact steps to GUARANTEE that failure."},{"label":"Red Team","description":"Build defenses to prevent those specific actions."}],"description":"Avoid stupidity instead of seeking brilliance. How do you guarantee failure?"},{"id":"second_order","name":"Second-Order Thinking","role":"Futurist","label":"1st Order","tagline":"For Strategy & Policy","desc":"And then what? Look past the immediate result to the consequences of the consequences.","promptTemplate":"Act as a Futurist. I am considering an action. 1. Map the 1st Order (Immediate). 2. Map 2nd Order (Consequence of consequence). 3. Red Team the 3rd Order (Long-term side effects). Should I proceed?","longPromptTemplate":"Act as a Futurist and Chess Player.\n\nI am considering a specific action. Do not look at the immediate result.\n\nRun a 3-Stage Simulation:\n1. First Order (T=0): What happens immediately? (Benefits/Costs)\n2. Second Order (T=6 months): What are the reactions to that first result? (Human behavior, ecosystem shifts)\n3. Red Team (T=5 years): What is the \"Butterfly Effect\"? Does this solve the problem or just move it?\n\nVerdict: Is the immediate gain worth the long-term cost?\n\nMy Action is: [Insert Action]","steps":[{"label":"1st Order","description":"Immediate result (e.g., Cheaper generator saves money)."},{"label":"2nd Order","description":"Real-world friction like the Wife Acceptance Factor — usability, noise, setup burden — can kill even technically perfect solutions."},{"label":"Red Team","description":"3rd Order & Butterfly Effects (Long term ecosystem shift)."}],"description":"And then what? Look past the immediate result to the consequences of the consequences."},{"id":"pareto","name":"Pareto Principle","role":"Efficiency Consultant","label":"Audit","tagline":"For Productivity","desc":"The 80/20 Rule. Find the vital few inputs that create the majority of outputs.","promptTemplate":"Act as a Ruthless Efficiency Consultant. Goal: [Insert]. 1. Audit all tasks. 2. Identify the Vital 20%. 3. Red Team: What are the risks of ignoring the rest? 4. Create an Elimination Plan.","longPromptTemplate":"Act as a Ruthless Efficiency Consultant.\n\nI want to achieve a goal, but I have very limited time/resources.\n\n1. The Audit: List the theoretical tasks required.\n2. The Leverage Analysis: Identify the Vital 20% of inputs that produce 80% of the results.\n3. Red Team (Risk Check): If I ignore the bottom 80%, what actually breaks? Is it fatal?\n4. The Plan: Give me a \"Not To Do\" list and a \"Hyper-Focus\" list.\n\nMy Goal is: [Insert Goal]","steps":[{"label":"Audit","description":"List all possible tasks/inputs."},{"label":"Identify","description":"Which 20% drives 80% of the value?"},{"label":"Red Team","description":"What breaks if I ignore the other 80%? (Risk Check)."}],"description":"The 80/20 Rule. Find the vital few inputs that create the majority of outputs."}]}