Decision stress-testing for founders and technical teams

The hidden flawin your plan isalready there.

Before you commit budget, headcount, roadmap, or architecture, paste the plan into Faultline. It shows the part most likely to break, the test that would catch it, and the line that should make you change course.

Not a brainstorming tool. Not a second opinion that politely agrees.
A plan that fails this review should not be made yet.

Decision under reviewFM-GTM-001Decision hold
Plan submitted

Cut enterprise sales after a 10% lift in self-serve signups. If product-led growth is working, sales looks redundant.

Hidden flaw detected

The growth signal may be contaminated.

Analytics records the conversion path, not the influence chain that preceded it. Sales-nurtured prospects register through self-serve and appear organic.

>25%
Stop threshold
6–9m
Sales rebuild lag

What happens when you submit a plan

Faultline finds the part of the plan everyone is assuming will work.

Most plans do not fail because the team was stupid. They fail because one important assumption was never tested hard enough. Faultline finds that assumption and tells you what to check before you commit.

01
Paste the planDescribe what you are considering, why it seems like the right move, and what would make it painful if you were wrong.
02
Faultline looks for the weak pointIt finds the hidden flaw, the likely failure path, the test to run, and the line that should make you stop or change course. Early-access reviews are human-checked before delivery.
03
Run the test. Then decide.Check the evidence before the plan becomes budget, headcount, roadmap, or code.

The plan was reasonable.
The logic was coherent.
The conclusion was wrong.

Plan submitted to Faultline

The team wants to reduce enterprise sales investment. Self-serve signups grew 10% last quarter. The logic seems reasonable: if product-led growth (PLG — meaning customers are finding, trying, and buying through the product instead of talking to a salesperson) is working, the company may not need as much sales coverage.

The sales cut is close to becoming the plan.

Strategy note — pre-commit Untested signal

Proposed shift: reduce enterprise sales, double down on self-serve growth

Self-serve signups increased 10% last quarter.
Product-led conversion appears to be trending up across cohorts.
Sales cycle is slow and expensive. Sales ROI is unclear.
Competitor moved product-led growth first and is growing faster.
Recommendation: move budget from enterprise sales into product and growth.
Key signal driving decision
+10%
Self-serve signups, Q3 vs Q2
Faultline decision memo · FM-GTM-001 Decision hold

Primary finding

Do not cut enterprise sales until you prove the self-serve growth is independent.

The 10% signup lift may be real, but the interpretation is fragile: enterprise prospects influenced by sales can still convert through self-serve and appear organic in the analytics stack.

Diagnostic

Cross-reference self-serve signup domains against CRM and marketing touchpoints from the prior 180 days.

Threshold

>25% prior sales contact: stop the cut. >40%: redesign attribution before personnel decisions.

Faultline classification
FM-GTM-001 · PLG Mirage Contaminated Growth Signal / Sales-Influenced PLG
Hidden flaw 01

The 10% self-serve growth is likely contaminated by prior sales activity. Enterprise prospects nurtured by sales are converting through the self-serve motion and being recorded as organic PLG demand. Your attribution system records the final action — not the influence chain that preceded it.

The signal may be real. The interpretation may be false.
Why you missed it 02

A prospect who received outreach, attended a demo, built internal consensus, and then self-registered appears indistinguishable from a genuinely organic user in a standard analytics stack. The internal read is self-reinforcing: leadership wants PLG to be working. The data, as reported, shows it is. The challenge does not come from the numbers — it comes from the attribution model behind them.

Failure path 03

Sales headcount is cut based on apparent PLG momentum → awareness drops → self-serve growth plateaus → pipeline weakens → revenue misses appear one to two quarters later → the attribution error is discovered after the damage is done.

Diagnostic test 04

Pull all self-serve signups from the past 90 days. Classify email domains. Cross-reference CRM and marketing touchpoints from the prior 180 days. Calculate what percentage of “organic” self-serve signups had prior sales influence.

Kill threshold 05

If >25% of self-serve signups share domains with prior sales contacts, do not cut sales. If >40%, halt the reallocation and redesign attribution before any personnel decision.

Do not commit before running the domain audit

The risk is not that PLG is false. The risk is cutting the sales engine before proving PLG is independent.

WHAT THE FULL DIAGNOSTIC ADDS

The summary above gives the call. The full diagnostic shows the reasoning chain behind it: threshold bands, decision asymmetry, known exceptions, safer path, and what would change the recommendation.

Decision asymmetry preview

Cost of pausing / false hold

Delay reallocation 60–90 days.

Low — recoverable.
Cost of proceeding incorrectly

Defund a causal input to growth and discover the attribution error 1–2 quarters later.

High — compounding.

Threshold band preview

Below 20% Independent PLG plausible → Proceed to no-touch cohort validation
20–35% Mixed signal → Hold reallocation until cohort evidence improves

The full diagnostic includes the complete threshold table, known exceptions, safer path, and supporting analysis.

VIEW FULL PACKET → Threshold bands · Decision asymmetry · Known exceptions · Safer path · What would change this

What Faultline produces

The artifact, not the chat.

Faultline turns a submitted plan into a reviewable decision artifact. The packet preserves the plan, isolates the load-bearing assumptions, and states what would change the decision.

Submitted Plan Anchor
Assumption Ledger
Wrong-If Signal
Decision Hold / No-Hold

The output is not a chatbot answer. It is a public-safe diagnostic packet with a visible hold / no-hold rationale.

When to use Faultline

Before any decision that's expensive to unwind.

Faultline is strongest when the plan is plausible, the stakes are material, and reversal would be slow, political, or expensive.

Before changing sales, marketing, or growth strategy
Before making a senior hire or replacing a leader
Before committing to a technical architecture
Before changing pricing or packaging
Before cutting, expanding, or reorganizing a team
Before signing a major vendor or partnership contract

More Decision Hold Patterns

Causal contamination map

How a decision becomes contaminated before commitment

Most bad commitments do not start with obviously bad data. They start when a plausible assumption begins selecting evidence, moving thresholds, and normalizing exceptions before anyone has defined the line that would change the decision.

01

Starting assumption

The team adopts a reasonable premise and starts planning around it.

02

Evidence selection pressure

Signals that support the plan get more attention than signals that would slow it down.

03

Threshold drift

The proof needed to proceed becomes softer because the commitment path is already forming.

04

Unreviewed exception

A known gap is treated as manageable without a written condition or owner.

05

Decision hold trigger

Faultline marks the missing evidence, threshold, or condition that should pause the commitment.

Contamination path: the plan starts shaping the evidence before the evidence has earned the plan.
Packet output: a public-safe Decision Hold / No-Hold packet with evidence gaps, contamination paths, and conditions that would change the decision.

Public demo library

What makes this different

Your team has context. They also have stakes.

Faultline has no reason to protect the plan.

AI chat tools
✕Often gives you a polished version of your own thinking
✕Generates confident answers without stress-testing them
✕No consistent kill threshold or diagnostic test
Consultants & advisors
✕Slow, expensive, and relationship-dependent
✕They may pull punches to preserve the relationship
✕Critique softens under social pressure
Faultline
✓Structured adversarial memo every time
✓Attacks the plan, not the person
✓Returns failure path, diagnostic test, and threshold

Request review

Paste a plan. Get back the flaw.

Send the decision in plain English. What are you considering— Why does it seem right— What would make being wrong expensive—

Early-access reviews are human-checked before delivery.

Questions: rob@faultline.me

What to include

What we're considering

The decision, the plan, or the move you are about to make.

Why it seems right

The evidence, logic, or signal making this look like the right call.

What would make being wrong expensive

Budget committed, headcount hired, architecture locked, contracts signed — whatever would be hard to undo.

Do not paste confidential documents. Strategic context in plain language is enough. Early-access reviews are returned by email. Timing depends on review volume.