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Decision Matrix

cosmicstack-labs/decision-matrix

A structured reasoning assistant that helps you make clear, confident decisions using proven frameworks — Pros/Cons, Decision Matrix (Pugh Matrix), Weighted Scoring, Pre-mortem, and Opportunity Cost Analysis.

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Install

one command, takes just this skill from the repository
npx skills add https://github.com/cosmicstack-labs/mercury-agent-skills --skill decision-matrix

The instruction itself

22 sections, as written by the author

Decision Matrix

What It Does

Takes the guesswork out of tough decisions by applying structured frameworks. Instead of spinning in circles with pros/cons lists, you get a repeatable system for comparing options, weighting what matters, and reaching a conclusion you can explain and defend.


Frameworks Available

1. Classic Pros & Cons (Benjamin Franklin Method)

Best for: Quick decisions with low-to-moderate stakes

| Step | Action |

|------|--------|

| 1 | Draw two columns: PROS and CONS |

| 2 | List every reason for and against — no filtering |

| 3 | Weigh each item (not all pros are equal). Assign +1 to +5 for pros, -1 to -5 for cons |

| 4 | Sum the scores. A net positive suggests "yes." Consider emotional weight too |

Guardrail: Pros/cons alone miss hidden assumptions. Always follow with: "What am I not considering?"

2. Weighted Decision Matrix (Pugh Matrix)

Best for: Comparing multiple options against multiple criteria

| Criteria               | Weight (1-5) | Option A | Option B | Option C |
|------------------------|-------------|----------|----------|----------|
| Cost                   |      4      |   8/10   |   6/10   |   9/10   |
| Time to Market         |      3      |   7/10   |   9/10   |   5/10   |
| Strategic Fit          |      5      |   9/10   |   4/10   |   7/10   |
| Team Capacity          |      2      |   6/10   |   8/10   |   4/10   |
| **Weighted Total**     |             |   113    |   92     |   103    |

Steps:

  • List all viable options (rows)
  • Define criteria that matter (columns)
  • Assign a weight (1-5) to each criterion based on importance
  • Score each option per criterion (1-10)
  • Multiply score × weight, sum across criteria
  • Highest weighted total wins — but sanity-check the result

3. Pre-Mortem

Best for: High-stakes decisions where risk mitigation is critical

> "It's 12 months from now and our decision has failed spectacularly. How did it happen?"

| Step | Technique |

|------|-----------|

| 1 | Assume the decision was made and led to disaster |

| 2 | Fast-forward and write the "post-mortem" — what went wrong? |

| 3 | Generate 5-10 plausible failure modes |

| 4 | For each failure, ask: "What could prevent this?" |

| 5 | Incorporate those safeguards into the decision |

Why it works: Humans are loss-averse. Imagining failure activates risk-awareness that simple pros/cons don't reach.

4. Opportunity Cost Frame

Best for: Deciding between two good options (where saying yes to A means saying no to B)

| Frame | Question |

|-------|----------|

| Cost of yes | What do I give up by choosing this? |

| Cost of no | What do I give up by not choosing this? |

| Regret test | If I look back in 5 years, which "no" would I regret more? |

| Opportunity comparison | If Option A didn't exist, would I choose Option B? |

Heuristic: If saying "no" to Option A doesn't feel like a loss, don't choose it.

5. ICE Score (Impact, Confidence, Ease)

Best for: Prioritizing many options quickly (features, ideas, experiments)

| Criterion | Scale | Question |

|-----------|-------|----------|

| Impact | 1-10 | How significant will the result be if successful? |

| Confidence | 1-10 | How sure are we about the expected outcome? |

| Ease | 1-10 | How easy/simple is this to execute? |

Formula: ICE Score = Impact × Confidence × Ease

Sort by score. Work on the highest first. Re-score when new data emerges.

6. The 10/10/10 Rule

Best for: Emotional or high-stakes personal decisions

| Time Horizon | Question |

|-------------|----------|

| 10 minutes | How will I feel about this decision in 10 minutes? |

| 10 months | How will I feel about it in 10 months? |

| 10 years | How will I feel about it in 10 years? |

Purpose: Shifts perspective from short-term emotion to long-term impact. If all three horizons align — it's an easy call. If they conflict, the 10-year horizon should usually win.


Trigger Phrases

| Phrase | Action |

|--------|--------|

| "Help me decide between..." | Starts a structured comparison of options |

| "Pros and cons of..." | Generates a weighted pros/cons table |

| "Should I [X] or [Y]?" | Runs a decision matrix or opportunity cost analysis |

| "What am I not considering?" | Surfaces blind spots and hidden assumptions |

| "Run a pre-mortem on..." | Scenarios worst-case outcomes to de-risk the decision |

| "Prioritize these for me..." | Uses ICE or weighted scoring to rank options |

| "Help me think this through..." | Combines frameworks layered for clarity |


Step-by-Step Instructions

Step 1: Define the Decision Clearly

A fuzzy question gets a fuzzy answer. Be specific:

  • ❌ "Should I change jobs?"
  • ✅ "Should I accept the offer at Company X ($120k, hybrid, startup) or stay at my current role ($110k, remote, corporate)?"

Step 2: Identify the Decision Type

| Decision Type | Recommended Framework |

|---------------|---------------------|

| Low stakes, 2 options | Pros & Cons (weighted) |

| Multiple options, many criteria | Weighted Decision Matrix |

| High risk, irreversible | Pre-mortem |

| Scarcity (time/money focus) | Opportunity Cost Frame |

| Prioritizing a long list | ICE Score |

| Emotional/personal | 10/10/10 Rule |

Step 3: Collect the Data

Gather:

  • All realistic options (at least 2, rarely more than 5)
  • All relevant criteria
  • Objective data where possible (numbers, dates, facts)
  • Subjective preferences (gut feel, values, identity)

Step 4: Apply the Framework

Run the framework step by step. Document scores, weights, and reasoning.

Step 5: Check for Bias

| Bias | Mitigation |

|------|-----------|

| Confirmation bias | Actively list reasons *against* your preferred option first |

| Recency bias | Consider decisions from 6+ months ago — does this feel different? |

| Sunk cost | "If I had no prior investment in this, would I still choose it?" |

| Status quo bias | "If this weren't the default, would I pick it?" |

Step 6: Decide and Commit

  • If the data is clear → decide.
  • If it's close (within 10% in weighted scoring) → go with gut feel or the more reversible option.
  • Write down the decision and your reasoning — future you will thank you.

Step 7: Review the Outcome

After the decision plays out, revisit your framework. Did your weights reflect reality? Did you miss a criterion? Retrospect improves future decisions.


Examples

Example 1: Freelancer Deciding Between Two Clients

> Input: "Should I take Client A ($5k, urgent, boring) or Client B ($3k, flexible, exciting project)?"

>

> Process: Weighted Decision Matrix

>

> | Criteria | Weight | Client A | Client B |

> |----------|--------|----------|----------|

> | Income | 4 | 9 (36) | 5 (20) |

> | Enjoyment | 3 | 3 (9) | 9 (27) |

> | Time Pressure | 2 | 3 (6) | 9 (18) |

> | Portfolio Value | 4 | 4 (16) | 9 (36) |

> | Total | | 67 | 101 |

>

> Result: Client B wins despite lower pay, because portfolio value and enjoyment outweigh the income gap.

Example 2: Solopreneur — "Should I Build Feature X?"

> Input: "Should I prioritize building a mobile app or improving onboarding?"

>

> Process: ICE + Pre-mortem

>

> ICE:

> - Mobile App: Impact 8, Confidence 4, Ease 2 → ICE = 64

> - Onboarding: Impact 6, Confidence 8, Ease 8 → ICE = 384

>

> Pre-mortem on mobile app decision: "We built the app but no one used it because onboarding was broken." → Clear signal to fix onboarding first.


Pro Tips

  • Weight matters more than scores: Most people fight over scores (7 vs 8). Weights determine the real outcome. Spend time getting weights right.
  • Add a "must-have" filter: Before any matrix, define non-negotiables. If an option fails a must-have, eliminate it immediately.
  • The 80% rule: If you have 80% of the information you could possibly get, decide. Waiting for perfect information is a decision too — usually the wrong one.
  • Revisit, don't regret: Write down why you decided. When doubt creeps in, re-read your reasoning. Trust past-you's process.
  • Some decisions are reversible: Jeff Bezos calls these "Type 2 decisions." If you can reverse it cheaply, don't over-analyze. Make the call fast.

How to use it

Copy the folder

Take cosmicstack-labs/decision-matrix from the repository into ~/.claude/skills for personal use, or into .claude/skills inside a project.

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