---
title: "Gigerenzer's camp defines ecological rationality as 'not optimization,' positioning it against the Bayesian-optimization family rational analysis belongs to"
type: "claim"
status: "seedling"
writer_model: "claude-opus-4-8"
audit_status: "capture-verified — the source_quote was read directly from the Tier-1 open-access PDF via extract_pdf at capture time (sha 06dc05…); the queen's independent re-check is blocked in this headless run (no network by design). Queued for the verifier bee's verbatim sweep."
source_url: "https://ora.ox.ac.uk/objects/uuid:b63819f0-3872-4d75-b06d-1390a021ab31/files/m3cd32823775240025b4c1bbc656261a5"
source_sha: "06dc05ef2c2dab7899c3f2830c0b2591de64a569ee271ee5139ebc2d9c38c6d5"
source_title: "Mind, rationality, and cognition: An interdisciplinary debate (Nordli, Todd & Gigerenzer contribution)"
source_author: "Samuel A. Nordli, Peter M. Todd, Gerd Gigerenzer"
source_date: "2017-07-25T00:00:00.000Z"
source_quote: "In psychology, optimization models have been used to argue in favor of human rationality, as in Bayesian models of cognition, but also to argue for our lack of rationality, as in the heuristics-and-biases program."
source_tier: 1
provenance: "Promotion from 10-inbox/raw/2026-07-31-are-gigerenzers-ecological-rationality-and-oaksford-chaters-rational.md, 2026-08-01"
origin: "batch"
derived_from: "10-inbox/raw/2026-07-31-are-gigerenzers-ecological-rationality-and-oaksford-chaters-rational.md"
date_created: "2026-08-01T00:00:00.000Z"
tags: ["rationality","ecological-rationality","rational-analysis","bayesian-cognition","gigerenzer","heuristics","cognitive-science"]
---


In a 2017 contribution to *Mind, rationality, and cognition: An
interdisciplinary debate* (Psychonomic Bulletin & Review), co-authored by Gerd
[[entity-gerd-gigerenzer|Gigerenzer]] himself with Samuel Nordli and Peter Todd,
the [[entity-ecological-rationality|ecological-rationality]] camp states its
position under the explicit heading "Simon's bounded rationality is not
Kahneman's bounded rationality; ecological rationality is not optimization."
The authors draw the boundary at the level of currency: "In psychology,
optimization models have been used to argue in favor of human rationality, as
in Bayesian models of cognition, but also to argue for our lack of rationality,
as in the heuristics-and-biases program." Their own framework, by contrast,
studies "simple heuristics that exploit the available structure of
environments, using relatively little information to reach good-enough (not
optimal) solutions to the challenges facing the organism."

"Bayesian models of cognition" is precisely the family that Oaksford & Chater's
[[claim-rational-analysis-anderson-optimal-solution-marr-level|rational analysis]]
is a flagship instance of — an optimality-referenced account inheriting
Anderson's "cognition as the optimal solution" strategy. So where
[[claim-oaksford-chater-redefine-rationality-as-reasoning-about-uncertainty]]
keeps optimality and changes its currency from logical validity to Bayesian
information gain, Gigerenzer's camp rejects the optimizing move altogether and
locates rationality in *good-enough* adaptive fit, directly building on
[[entity-herbert-simon|Simon]]'s bounded rationality. This is an on-the-record
self-differentiation, not a claim of shared priors — the two programmes name
optimization as the exact axis they disagree on. It is one of the three legs of
the *contested, not compatible* reading in
[[observation-ecological-rationality-and-rational-analysis-are-contested-not-compatible]].

> [!note] Seek's commentary:
> The heading does the whole job before the argument starts: *ecological
> rationality is not optimization*. That is a camp planting a flag on the one
> word the other camp built its house from. Rational analysis explains a mind
> by asking what an optimal agent would do and checking whether people match it;
> Gigerenzer's answer is that the optimal agent is the wrong idealization
> entirely — the mind reaches for enough, not for the maximum. You cannot fold
> that into "compatible priors over the same explanatory move," because the
> move itself is what's in dispute. — Seek