---
title: "Founder Performance Articles | Len P. van der Hof"
description: Evidence-informed systems for focus, resilience and sustainable founder performance.
image: "https://lenvanderhof.com/photos/len-portrait-1.jpg"
---

Category

# Founder Performance

Evidence-informed systems for focus, resilience and sustainable founder performance.

Founder Performance

## [What does calibrate mean? Compare, record, then decide: calibration is not adjustment](https://lenvanderhof.com/en/blog/calibrate-meaning/)

Read the instrument before you turn the screw. The same rule works on your own judgment.

Len P. van der Hof2 October 2026

Founder Performance

## [Calibration techniques for founders: five practices that fit a week](https://lenvanderhof.com/en/blog/calibration-techniques-for-founders/)

You do not need a nine-skill curriculum to stop treating a loud sentence as a probability.

Len P. van der Hof13 September 2026

Founder Performance

## [Diagnostic evidence vs fitting evidence: what changes a belief?](https://lenvanderhof.com/en/blog/diagnostic-evidence-vs-fitting-evidence/)

A warm reply may be real and still tell you little about a sales target. The useful question is whether campaigns that miss the target show the same sign.

Len P. van der Hof28 October 2026

Founder Performance

## [Do 90% of startups fail? How to fact-check a viral statistic in ten minutes](https://lenvanderhof.com/en/blog/do-90-percent-of-startups-fail/)

The 90% figure does exist somewhere. It just measures something other than what the post says.

Len P. van der Hof6 October 2026

Founder Performance

## [Familiar vs true: why repeated claims feel right](https://lenvanderhof.com/en/blog/familiar-vs-true/)

Three places you heard a claim may all lead back to one person. Trace the route before you count the sources.

Len P. van der Hof22 October 2026

Founder Performance

## [Write the five lines before you act](https://lenvanderhof.com/en/blog/five-line-decision-journal/)

An entry after the outcome is a memoir. An entry before it is a record.

Len P. van der Hof26 August 2026

Founder Performance

## [Flow is a condition of work, not a brand mood](https://lenvanderhof.com/en/blog/flow-is-a-condition-of-work/)

Boredom is too easy. Anxiety is too hard. Flow sits between, and it has to be built.

Len P. van der Hof11 September 2026

Founder Performance

## [A holiday is not a refill protocol](https://lenvanderhof.com/en/blog/founder-capacity-is-infrastructure/)

Infrastructure has a spec, slack, and an owner. A mood after two weeks off is none of those.

Len P. van der Hof25 August 2026

Founder Performance

## [Founder systems you can run when willpower is gone](https://lenvanderhof.com/en/blog/founder-systems-when-willpower-is-gone/)

Willpower is not the instrument. A weekly cadence that does not ask you to want it more is.

Len P. van der Hof22 August 2026

Founder Performance

## [How to run a pre-mortem in 20 minutes](https://lenvanderhof.com/en/blog/how-to-run-a-pre-mortem/)

Asking "what could go wrong?" turns every doubt into a challenge to the plan. Declaring "it has failed" makes explaining the failure the task. The result is a list of risks, not proof of a better decision.

Len P. van der Hof16 October 2026

Founder Performance

## [LEVEL vs CALIBRATE: check the claim, or check your own judgment](https://lenvanderhof.com/en/blog/level-vs-calibrate/)

One asks whether this claim can carry this decision. The other asks whether your 70% really means 70%.

Len P. van der Hof26 September 2026

Founder Performance

## [The 90% test: why 'I'm sure' is right far less often than it feels](https://lenvanderhof.com/en/blog/overconfidence-90-percent-test/)

A range you are 90% sure of should miss about once in ten. In one experiment it missed nearly half the time.

Len P. van der Hof8 October 2026

Founder Performance

## [The planning fallacy: a plan is not a forecast](https://lenvanderhof.com/en/blog/planning-fallacy/)

Your plan says what you intend to do. Your record of similar projects says how long that kind of work has taken.

Len P. van der Hof15 October 2026

Founder Performance

## [The Psychology of Founder Resilience: Capacity Is Infrastructure](https://lenvanderhof.com/en/blog/psychology-of-founder-resilience-introduction/)

Resilience is not what you are. It is what you run. This book turns capacity into operator infrastructure you can execute on your worst Tuesday.

Len P. van der Hof5 August 2026

Founder Performance

## [Cognitive reappraisal vs positive thinking: keep the facts](https://lenvanderhof.com/en/blog/reappraisal-vs-positive-thinking/)

The board's request is a fact. Your verdict on what it means is still a guess. Separate the two before you respond.

Len P. van der Hof26 October 2026

Founder Performance

## [What resilience research found: staying level is not bouncing back](https://lenvanderhof.com/en/blog/resilience-research-findings/)

Staying roughly level and recovering after a sustained drop are different paths. That distinction changes how you read a difficult week.

Len P. van der Hof17 October 2026

Founder Performance

## [Reversible vs irreversible decisions: classify the door before you decide](https://lenvanderhof.com/en/blog/reversible-vs-irreversible-decisions/)

Bezos split decisions into one-way and two-way doors. Most founder decisions sit somewhere in between, and some doors close while you still think they are open.

Len P. van der Hof23 October 2026

Founder Performance

## [Stoic systems: judgment as infrastructure, not a mood](https://lenvanderhof.com/en/blog/stoic-systems/)

A quote wall is not decision infrastructure. Judgment under pressure needs a protocol you can run and review.

Len P. van der Hof20 September 2026

Founder Performance

## [Being stoic is not Stoicism: the philosophy was never about hiding your feelings](https://lenvanderhof.com/en/blog/stoic-vs-stoicism/)

The everyday word praises a straight face. The philosophy asked what you concluded behind it.

Len P. van der Hof14 October 2026

Founder Performance

## [What is a calibration session, and what should it produce?](https://lenvanderhof.com/en/blog/what-a-calibration-session-produces/)

HR calibration aims for consistent ratings. Forecasting calibration puts confidence to a later test. In both, agreement alone does not show that the session worked.

Len P. van der Hof18 October 2026

Founder Performance

## [What calibration means: matching confidence to evidence](https://lenvanderhof.com/en/blog/what-calibration-means/)

Confidence is a report, not a mood. A loud claim with a thin source is a calibration failure, not conviction.

Len P. van der Hof28 August 2026

Founder Performance

## [What does 'likely' mean? Ask five people and you get five numbers](https://lenvanderhof.com/en/blog/what-does-likely-mean/)

A shared word is not a shared number. The CIA learned that in 1951, and most teams still have not.

Len P. van der Hof4 October 2026

Founder Performance

## [What is a confidence grade? Why "high confidence" is not 90%](https://lenvanderhof.com/en/blog/what-is-a-confidence-grade/)

"High confidence" tells you about the evidence behind a claim. It does not tell you the odds, or what to do next.

Len P. van der Hof28 September 2026

Founder Performance

## [What is founder resilience? Capacity, not a mood](https://lenvanderhof.com/en/blog/what-is-founder-resilience/)

The company can keep moving while you are its hidden single point of failure. That is what this word is for.

Len P. van der Hof24 September 2026

Founder Performance

## [What is LEVEL? A five-step check before you act on a claim](https://lenvanderhof.com/en/blog/what-is-level/)

The same evidence can be good enough for a small test and too weak for a big commitment. LEVEL is how you tell the two apart.

Len P. van der Hof25 September 2026

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