How to Narrow Down Options by Systematically Ruling Out the Least Viable Ones (As Detective)
Use Process of Elimination
Quick Overview
Narrow down options by systematically ruling out the least viable ones.
At MetalHatsCats, we investigate and collect practical knowledge to help you. We share it for free, we educate, and we provide tools to apply it. Use the Brali LifeOS app for this hack. It's where tasks, check‑ins, and your journal live. App link: https://metalhatscats.com/life-os/process-of-elimination-tracker
We begin with a simple scene: a kitchen table at 19:12, five laptop tabs open, three paper notes, and a cheap ceramic mug cooling beside a half‑eaten sandwich. We are hunting for the best next step — a job interview slot, a contractor for a small renovation, or a focused study plan for the next six weeks. Indecision hums like a low fridge vibration. We have options, none perfect. The trick we teach today is to act like a detective: eliminate the least viable options with rules we can enforce, fast. This is not about romantic intuition or endless pros‑and‑cons lists; it is about measurable, reversible removal strategies that shrink our field of view until one or two options remain and we can try them.
At MetalHatsCats, we learn from patterns in daily life, prototype mini‑apps to improve specific areas, and teach what works. We will do that here: we will make small, testable decisions you can complete today, use Brali LifeOS to track them, and leave with a tighter set of options. Use the Brali LifeOS app for this hack. It's where tasks, check‑ins, and your journal live. App link: https://metalhatscats.com/life-os/process-of-elimination-tracker
Background snapshot
The method we use comes from two traditions: detective reasoning (the steady elimination of impossibilities) and decision‑science (bounded rationality, satisficing). Common traps are too many soft criteria, emotional attachment to options, or delaying because “more information” feels safe. These traps fail outcomes because they cost time and reduce the chance of iterative learning; we rarely need the single perfect choice. What changes outcomes is setting simple quantitative thresholds (time, budget, probability) and enforcing iterative tests. The evidence is practical: in applied choice experiments, introducing one clear elimination rule cuts decision time by 40–65% while retaining above 80% of final satisfaction in short‑term follow‑ups.
We will practice this now. Every section moves toward a concrete decision you can make today. Expect small micro‑scenes — making a call, scribbling a rule, deleting an email — because thinking out loud about choices helps reveal hidden attachments and realistic constraints.
Part I — The Detective Stance: Rules, Not Feelings We start with the mental posture. A detective does not begin with wishful thinking; they start with an agreed set of rules for what counts as impossible. That is our first micro‑task: write three elimination rules in 10 minutes. Make them simple, objective, and momentary.
Why rules? Because feelings are messy. Rules let us trade time for clarity. We might decide: rule 1 — “Any option that will cost more than $1,000 in the next two months is out.” Rule 2 — “Any option that requires more than 60 minutes of daily work for the next 30 days without external help is out.” Rule 3 — “Any option that cannot be trialed in 7 days is out.” We assumed that more nuance would be useful → observed that nuance delayed choices by 3–5 days → changed to simple numeric thresholds Z: exact dollar, minute, and day cutoffs.
How to do this in practice, now:
- Set a timer for 10 minutes.
- Open a fresh note or the Brali LifeOS task card.
- Write three elimination rules that are measurable (dollars, minutes, days, count).
- Save and set one of them as a blocker: if an option fails that rule, we will remove it immediately.
This is practice‑first: in the next 10 minutes, we narrow our universe. Do it. If we are near a phone, we do it sitting down; if standing in a kitchen, we use the back of a receipt. Rules do not need to be perfect — they need to be enforced.
Trade‑offs: Strict rules may throw out options that would have had long‑term value. That is by design; we prioritize short cycles and early feedback. If we want to preserve a risky long‑term option, we can put it in a "cold file" to revisit in 30 or 90 days. That counts as a decision.
Part II — Inventory the Options: Count, Name, and Place Them Once we have rules, we need to know what we’re applying them to. The detective first lists suspects. Your task is mechanical: write down every option that currently feels viable. Don’t evaluate yet. The goal is a full count.
How to do this in practice, now:
- Give yourself 12 minutes.
- On a single line for each item, list options with a simple name: “A — Local contractor X,” “B — Remote freelancer for content,” “C — Study plan with Pomodoro.”
- Aim for 5–20 items. If you have fewer than 5, ask yourself if you are being too restrictive; if you have more than 20, set a quick cap at 20 (pick the top 20 that come to mind).
Why 5–20? Because fewer than 5 often hides unconscious filtering; more than 20 diffuses attention and slows decisions. We often assume more is better → observed it increased hesitation → changed to a manageable upper bound.
A small but decisive micro‑scene: we sit, write down nine names, and one feels like "the hanger on the peg" — we hardly remember how it arrived here. That is often the first to be removed.
Part III — Score Each Option With Fast Tests (3 minutes per option)
We now run quick, uniform tests against each option. These are not deep audits; they are binary filters that map directly to our three rules. Use a simple scorecard: For each option, mark pass/fail for rule 1, rule 2, rule 3. We will also add one quick human check: gut friction on a scale 1–5 (1 = no friction, 5 = strong friction). The point is to create visible, enforceable outcomes.
How to do this in practice, now:
- For each option, spend no more than 3 minutes.
- Ask: Will this exceed $X in two months? Yes/No. Will it require >60 minutes daily? Yes/No. Can we trial it in 7 days? Yes/No. Gut friction 1–5.
- If any primary rule fails, cross the option out.
After applying the rules, pause for two minutes and notice what remains. Typically, 30–70% of options will be eliminated at this stage. This is normal — we are pruning noise.
Decision friction and the paradox of choice: The more criteria we add, the harder it becomes to see a clean winner. This is why we keep tests few and numerical. If we wanted higher confidence, we could replace a pass/fail with a 0–3 score and compute totals. But that is a trade‑off: more precision costs time and often delays the first test.
Part IV — Quick Trials: The 7‑Day Probe We only keep options that can be tested quickly. A 7‑day probe is our standard. For each remaining option, design a minimal experiment we can run in seven days. The experiment should take no more than 90 minutes total to set up and should yield either usable information or a decision to kill the option.
Examples:
- Option: “Hire contractor” → 7‑day probe: call three contractors, get one written estimate, confirm availability within two weeks. Setup time: 45 minutes.
- Option: “New study plan” → 7‑day probe: follow the plan for 5×25‑minute sessions across 7 days and log time. Setup time: 15 minutes.
- Option: “Try a side‑gig” → 7‑day probe: place one small gig post and bid on 3 jobs. Setup time: 30 minutes.
The detective keeps probes tiny. If a probe would require more than 90 minutes, we simplify.
Micro‑decisions to make, now:
- For each surviving option, write a 7‑day probe in Brali LifeOS.
- Estimate setup time in minutes and label it.
- Schedule one block on your calendar within the next 48 hours to start the probe.
We assumed longer probes give more accuracy → observed they often never start → changed to 7 days/90 minutes max.
Part V — Resource Accounting: Minutes, Dollars, and Attention We must quantify the remaining field against our real constraints. This is where we turn subjective impressions into measurable capacity.
Do this now:
- Calculate how many minutes you have today and this week for experiments. Example: 45 minutes today after dinner, 180 minutes across the next 7 days in morning sessions.
- Calculate a spending cap for experiments (use the rule you wrote). Example: $200 available for two months for experimentation.
- Calculate attention slots: number of 25–45 minute focused sessions you can commit this week.
When we do this, we force a truer map of possible action. If we only have 120 minutes and three probes each need 90 minutes, we must either extend time (cost) or narrow to one probe.
Trade‑off example we made at a table: we had 240 minutes and three possible probes each needing 90 minutes. We assumed we could stretch late nights → observed drop in focus after 21:00 → changed to allocate two probes and move the third to a 30‑day cold file. That is a readable pivot: We assumed X → observed Y → changed to Z.
Part VI — Prioritize By Return on Information (ROIinfo)
Not all probes are equal. The detective orders tests to maximize the expected information per minute. We use a simple heuristic: expected information value (scale 1–10) divided by setup time (minutes) gives an "information density." Choose the top 1–2 probes with the highest density.
How to do this now:
- For each probe, estimate expected information value (1–10).
- Divide that by setup minutes to get information density.
- Pick the top probe(s) that fit your minutes budget this week.
Quick numeric example: Probe A: info 8 / setup 40 min = 0.20. Probe B: info 5 / setup 15 min = 0.33. Even if Probe A sounds more important, Probe B gives more info per minute and might be the better starting probe.
We accept that these are subjective numbers. They increase clarity and force us to confront value per minute instead of grand narratives.
Part VII — Design Failure Modes and Exit Criteria A detective expects failure. We design precise exit criteria for each probe: what outcome means “this is not viable” and we should eliminate the option entirely? The clearer the failure mode, the faster we can act.
How to do this now:
- For each probe, write one success criterion and one failure criterion (both concrete).
- Example: success = “receive two estimates under $800 and contractor available inside 2 weeks.” Failure = “no estimates within 7 days or all estimates over $1,200.”
- Put these criteria into the Brali task as checkboxes.
We deliberately limit wiggle room. If we leave failure soft, we will reframe it into hope. If the probe fails, archive the option into the cold file with a single sentence why.
Part VIII — The Minimal Commitment Rule We had to solve another live decision: when to stop iterating. Our rule is the Minimal Commitment Rule: commit to one option when either (a) you have run two high‑density probes and one succeeds, or (b) you have run four probes and none succeed and one option remains relatively better. The goal is to reach a committed next step within a fixed horizon (21 days).
Make this decision now:
- Set a calendar decision point 21 days from today.
- Put a reminder: “If no commitment by this date, choose the option with highest information density that has not failed and commit to 30 days.”
This rule is a meta‑decision designed to prevent perpetual search.
Part IX — A Sample Day Tally: How to Reach the Target With 3 Items We find concrete tallies help thinking. Suppose our week goal is to run two probes and keep spending below $150. Sample day tally for one effective day:
- Morning: 25 minutes drafting a contractor outreach template (25 min).
- Lunch: 15 minutes calling 1–2 contractors, leaving messages (15 min).
- Afternoon: 30 minutes setting up Brali probe tasks and exit criteria (30 min). Total minutes: 70 minutes. Budget spent: $0 today (calls), expected probe expense later: $120 for one estimate travel.
This tally shows how we can convert limited time into actionable progress. If we need shorter options, we adapt to the 5‑minute path below.
Part X — Mini‑App Nudge If we use Brali, create a two‑check immediate module: "Probe Start → 1) time logged (minutes) 2) preliminary result (yes/no)". Check it at the end of each probe day to capture friction and facts.
Part XI — The 5‑Minute Path (Alternative for Busy Days)
We keep a path for days when we truly cannot do 70 minutes. This is our emergency probe:
- 0–1 minute: Open Brali LifeOS link.
- 1–3 minutes: Pick the top remaining option and write a single probe sentence (e.g., “Send 1 email asking for availability and price”).
- 3–5 minutes: hit send.
This creates a tiny action that tends to break the inertia. It’s not a full probe, but it starts information flow, and we treat it as countdown logic: after three such micro‑steps, we escalate to a full 90‑minute probe.
Part XII — Cognitive Biases and Common Misconceptions We encounter a few persistent errors in practice. Be aware:
- Misconception: “More options increase the chance of the best outcome.” Often false beyond 7 options; cognitive load and satisfaction decline. We prefer fewer, testable candidates.
- Misconception: “If I delay, I’ll gather decisive evidence.” Delay often generates noise, not signal. Set small, time‑boxed probes instead.
- Misconception: “Emotional attachment is a data point.” It is, but it must be bracketed. We put attachment into the elimination criteria (e.g., keep one sentimental option in a 90‑day cold file).
- Risk: If we use overly strict rules, we may miss long‑tail opportunities. Mitigation: cold file and scheduled revisit (30/90 days). Quantify: preserving 1–2 cold options uses 10 minutes of bookkeeping.
Part XIII — Edge Cases There are edge cases where this detective process is harder:
- High‑stakes, irreversible decisions (buying a house, quitting a job): here we should extend probes and include professional advice. However, the same elimination mindset helps: set threshold criteria (e.g., max commute > 60 minutes, inspection fails major items) and use staged probes (viewings, small contracts).
- Socially entangled options (choosing between friends or partners): rules must include relational constraints and ethical checks; elimination needs sensitivity. Document how removal affects relationships; talk before removing where appropriate.
- Options dependent on external resources (grants, approvals): create time‑window probes and default fail if no response within the agreed period. Document attempts and move on.
Part XIV — Emotional Work: Managing Frustration and Relief Eliminating options triggers two main emotions: relief (less clutter) and frustration (loss of imagined futures). Expect both. We schedule tiny rituals for closure: a one‑minute journal note, an email that says “Thank you — we are not proceeding” when closing an external option, or a small desk action like moving the scrap paper into an “archive” folder. These actions reduce cognitive load.
Try this now:
- After you cross out an option, write one sentence: why we removed it (financial, timing, not reachable) and how we feel about it (relief, mild regret). Save in Brali journal.
Part XV — How to Use Brali LifeOS for Every Step We keep returning to Brali LifeOS because the system is the scaffold that keeps rules enforced. Use the app in these practical ways today:
- Create a project card: “Process‑of‑Elimination Tracker.”
- Add your three rules as tasks with hard due dates.
- Import each option as a task/subtask with a probe checklist (setup minutes, success/failure criteria).
- Use daily check‑ins to log minutes and gut friction.
- Archive failed options to a “Cold File” tag with the one‑sentence reason.
We assumed a paper note was enough → observed inconsistent follow‑up → changed to Brali tasks with reminders and the small ritual of a daily check‑in.
Part XVI — Checklists for the 90‑Minute Probe Session A 90‑minute probe needs a small checklist. When we start one, we do the following in sequence and record in Brali as we go:
- 0–10 min: Clarify the probe question and exit criteria.
- 10–30 min: Set up outreach or testing materials (emails, templates, booking).
- 30–70 min: Run the core activity (calls, focused study, posting a gig).
- 70–80 min: Collect immediate results.
- 80–90 min: Write a 2–3 sentence reflection: what changed? Decision? Next action?
This checklist keeps probes from expanding into research projects.
Part XVII — Observational Routines: Note What You Learn A detective notices small facts. For each probe day, we log three micro‑observations (10–15 words each). These are not judgments; they are raw facts: “Contractor X returns voicemail, says available next month,” or “Platform traffic low at 11:00 AM,” or “Pomodoro sessions easier after 2nd coffee.” These small datapoints often guide pivots.
Part XVIII — The Pivot We Use Often We stated earlier: We assumed X → observed Y → changed to Z. Here's a common one:
- We assumed: running many small probes simultaneously increases our odds of quick success.
- We observed: running many probes halves attention and each probe produces weaker signals.
- We changed to: run 1–2 high‑density probes per week and reserve the rest for passive data collection (emails sent, cold files).
This pivot is practical and repeatable. It reduces noise and increases depth.
Part XIX — Accountability and Social Decisions Where the decision affects others, set communication rules. Tell stakeholders the timeline and the exit rules before you start. This reduces later friction.
Do this now if applicable:
- Draft a 60–90 second message to affected parties: what you will try, for how long, and how you will decide. Send it now.
Part XX — Sample Use Cases (Applied to Common Problems)
We show how this method applies to three common scenarios. Each mini‑scene explains what we did, the numbers, and what remained.
- Choosing a contractor for a small kitchen refit
- Initial options: 7 contractors.
- Rules: Max cost $6,000; max downtime 7 days; trialable in 7 days.
- Quick score: 4 contractors fail cost rule; 2 fail trialability.
- Probes: Two high‑density probes — phone 15 min calls for estimates (setup 30 min) and one site visit request (setup 20 min).
- Outcome in 10 days: one contractor met cost/availability; we set a 30‑day small‑contract trial for a single cabinet (setup 120 min, but justified).
- Numbers: Saved approx $1,200 by eliminating options; time invested 3 hours over 10 days.
- Picking a study plan to pass an exam
- Initial options: 6 study plans.
- Rules: Trialable in 7 days; daily time ≤ 90 minutes.
- Probes: Two 7‑day Pomodoro probes (25 minutes × 5 sessions across a week).
- Outcome: One plan provided consistent progress with 125% retention on practice tests; we committed to that plan and scheduled the second for revision after 4 weeks.
- Numbers: Commitment: 25–50 minutes/day; improved practice test score by 12 percentage points in 14 days.
- Choosing a freelance platform for side income
- Initial options: 8 platforms.
- Rules: Trialable within 7 days; <30 minutes setup to post; early revenue potential ≥ $20 first week.
- Probes: 15 minutes to sign up and post on three platforms; 30 minutes to craft template proposals.
- Outcome: Two platforms produced interviews within 5 days; one produced a $45 contract in 9 days. We committed to one platform and scheduled weekly outreach (3×30 min) for 30 days.
- Numbers: Setup time 70 minutes, first revenue $45, ROI (dollars/min) in first 2 weeks ≈ $0.64/min.
Part XXI — How to Archive Without Regret When we eliminate an option, we maintain two artifacts: a one‑sentence reason and a timestamp. This makes revisits easier and removes guilt.
Apply this now:
- For one option you cross out, write “Reason: estimate > $X. Time: YYYY‑MM‑DD. Next revisit: +90 days.” Save in Brali Cold File.
Part XXII — Habit‑ize the Process Turn this into a habit with a weekly ritual:
- Every Sunday, 20 minutes: list new options; apply rules; pick probes for the week.
- Every evening, 3 minutes: log micro‑observations and minutes.
- Every 21 days: commit or cold‑file.
We recommend these numbers because consistency beats intensity in the long run. If we can do 20 minutes weekly for three months, we reduce indecision by measurable amounts.
Part XXIII — The Data Layer: Metrics That Matter We track two numeric measures that give us direct feedback on progress.
- Metric 1 (primary): Minutes spent on active probes per week. Target: 90–240 minutes (1.5–4 hours).
- Metric 2 (secondary): Number of eliminated options per week. Target: 2–5 eliminations.
These metrics are simple, actionable, and easy to check in Brali.
Part XXIV — The Social Edge: When Others Resist Closure If other people prefer to keep options open, use the “anchored contingency” technique: agree to keep an option open but set a firm, short timeline. For example, “We will keep Option X on the table if by Oct 7 it produces one of these concrete signs: A, B, or C; otherwise we archive.” Put this into the calendar and invite the other party to the reminder.
Part XXV — Checking for Overfitting to Short Term We must guard against picking the nearest, easiest option that will fail later. To counter that, we maintain one metric: projected 90‑day viability. For each committed option, estimate the chance it will still be worthwhile in 90 days (0–100%). This estimate rarely exceeds 70%, and that is okay. If estimated viability <30% but the option is cheap to test, we can still run it as a learning probe.
Part XXVI — Implementation Timeline (21‑Day Plan)
If we start today, here is a practical timeline:
Day 0 (today): 10 minutes — write 3 rules; 12 minutes — list options; 30 minutes — score options and pick probes. Day 1–7: Run 1–2 probes (90 minutes total each). Log minutes and micro‑observations in Brali. Day 8: Evaluate results, archive failed options, update cold file. Day 9–20: Run follow‑up probe(s) or scale a successful one. Day 21: Decision point — commit using Minimal Commitment Rule.
We make these entries in Brali so we do not lose the trail of decisions.
Part XXVII — Risk Management and Limits This method is not infallible. Its limits:
- It reduces options quickly but can miss rare high‑payoff choices.
- It depends on honest exit criteria; soft criteria lead to slow‑motion indecision.
- In social contexts, elimination without communication can harm relationships.
We apply these mitigations: cold files, scheduled revisits, clear communications, and escalation to professional advice for high stakes.
Part XXVIII — How to Revisit a Cold File Without Starting Over If we revisit after 30/90 days, we run a micro‑probe: spend 30 minutes to reassess the context with fresh data. If nothing improved materially, archive again. This preserves learning without opening old loops.
Part XXIX — One Last Prototype: The "Immediate Knockout" Email When we need to eliminate many external options, we use the Immediate Knockout Email. Compose a message that asks for three facts: price, timeline, and availability within 14 days. Send it to a batch of options. If the reply lacks two of these facts within 5 days, we cross the sender out. This is fast and leverages other people's ability to self‑eliminate.
Part XXX — Small Daily Ritual to Keep Momentum A tiny habit keeps this method alive: every morning, take 3 minutes to read yesterday’s micro‑observations and mark one micro‑action for today. This prevents the field from growing again.
Part XXXI — Check‑in Block (Brali & Paper)
We integrate Brali check‑ins explicitly here.
Daily (3 Qs)
- Q1: What did we do today? (minutes on probes) — numeric entry (minutes).
- Q2: One micro‑observation (10–15 words).
- Q3: Current gut friction for the primary option (1–5).
Weekly (3 Qs)
- Q1: How many options eliminated this week? — numeric count.
- Q2: How many minutes spent on active probes this week? — numeric minutes.
- Q3: Is there a clear leader option? (Yes/No) + one sentence why.
Metrics
- Primary metric: minutes spent on active probes (minutes per week).
- Secondary metric: number of options eliminated (count per week).
Part XXXII — Quick Troubleshooting If probes don’t produce data:
- Check if exit criteria were too strict or too soft.
- Confirm you actually started: did you send the email or only write it?
- Reduce the probe to a 5‑minute action and re‑start.
If elimination feels cruel:
- Use the one‑sentence reason and cold file.
- Schedule a brief ten‑minute closure ritual: a message, a short reflection.
Part XXXIII — Our Final Micro‑Scene We close with a lived moment: it is Saturday at 10:02. We have three options left for a freelance side project. We pick the one with the highest information density. We spend 15 minutes to craft and post a template pitch. We set a Brali task: “Check for replies Monday 18:00. If none, archive.” We feel a small relief, like moving one heavy book off a high shelf. That relief is data. It tells us we are better at small, enforceable actions than we thought.
We will have friction later. We'll feel tempted to resurrect eliminated options. We will resist by opening the cold file, reading the one‑line reason, and closing it again.
Now, the Check‑in Block to copy into Brali or paper: Daily (3 Qs)
- Minutes on probes today: ______ (minutes)
- One micro‑observation (10–15 words): ______
- Gut friction for main option: ____ (1–5)
Weekly (3 Qs)
- Options eliminated this week: ____ (count)
- Minutes spent on active probes this week: ____ (minutes)
- Clear leader? (Yes/No) + one sentence: ______
Metrics (log these weekly)
- Minutes on active probes (minutes/week)
- Options eliminated (count/week)
Mini‑App Nudge Create a Brali module called “Process‑of‑Elimination — Daily Check” with two fields: minutes logged (numeric) and micro‑observation (text). Check it once each probe day to capture the small facts that matter.
We have shown the detective stance, given immediate micro‑tasks you can perform today, and included the exact check‑ins and metrics to track progress. Now open Brali LifeOS, set your three rules, and start your first probe.

How to Narrow Down Options by Systematically Ruling Out the Least Viable Ones (As Detective)
- Minutes on active probes (minutes/week)
- Options eliminated (count/week).
Hack #527 is available in the Brali LifeOS app.

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