---
title: "The phrase 'credit-assignment' in Minsky & Papert's Perceptrons appears only in the 1988 Expanded Edition's Epilogue defending Rosenblatt — not in the 1969 original"
type: "claim"
status: "seedling"
audit_status: "Tier-1 for the phrase's presence + location (OCR full-text of the digitized 1988 Expanded Edition via the OpenLibrary search-inside index, converging on scan pp. 316/318 across two independent scans; no other occurrence anywhere). 'Absent from the 1969 original' rests on page-count triangulation (292pp expanded vs 258pp first edition), not a direct 1969-vs-1988 diff — flagged [unverified: needs standalone 1969 scan]. | 2026-07-09 scheduled audit (auditor claude-fable-5; writer same model per provenance — weaker check): phrase independently re-reproduced via OpenLibrary search-inside, matching only Expanded Edition scans; Internet Archive item metadata re-confirms 1988 edition, 'xv, 292 p.', 316 image pages — consistent with the scan-page placement. Correction: the full sentence begins 'First, Rosenblatt's…' — the quote had silently dropped the leading 'First,'; restored in source_quote and body. The [unverified: needs standalone 1969 scan] flag STANDS."
source_url: "https://archive.org/details/perceptronsintro0000mins"
source_title: "Perceptrons : an introduction to computational geometry : Minsky, Marvin Lee, 1927- : Free Download, Borrow, and Streaming : Internet Archive"
source_author: "Marvin Minsky and Seymour Papert"
source_date: 1988
source_tier: 1
source_quote: "First, Rosenblatt's credit-assignment method turned out to be as effective as any such method could be."
provenance: "Promotion from 10-inbox/raw/2026-07-09-does-the-term-or-framing-credit-assignment-appear.md, 2026-07-09, Fable clean-lane promotion marathon."
origin: "batch"
derived_from: ["20260709-0213-does-the-term-or"]
date_created: "2026-07-09T00:00:00.000Z"
tags: ["perceptrons","minsky-papert","credit-assignment","terminology","history-of-ml","citation-practice"]
audits: ["2026-07-09 claude-fable-5"]
---


The phrase "[[entity-credit-assignment|credit-assignment]]" does occur in the digitized text of [[entity-marvin-minsky|Minsky]] &
Papert's *Perceptrons* — but in the **1988 Expanded Edition's added end matter**,
where the authors defend [[entity-frank-rosenblatt|Rosenblatt]]'s learning rule against 1980s [[entity-connectionism|connectionist]]
critics: "First, Rosenblatt's credit-assignment method turned out to be as
effective as any such method could be." Two independent Internet Archive scans of the Expanded
Edition index this identical sentence at scan pp. 316/318, and no occurrence of
"credit assignment" appears anywhere earlier in either scan.

The location places it beyond the 1969 first edition's text. The Expanded Edition
runs to 292 printed pages (Internet Archive item metadata) versus the 1969 first
edition's 258 pages (1969 *Science* review citation line) — the ~34-page difference
being the added Prologue and Epilogue; the passage sits at scan pp. 316–318, in the
Epilogue region well past where the 1969 text (ending p. 258) concluded. Wikipedia
independently places the same passage in the authors' retrospective rebuttal. A
web-search synthesis claiming a "section 11.7 / Samuel's checkers" credit-assignment
discussion *inside* the 1969 body could not be reproduced against the primary
index and is treated as a likely conflation with Minsky's 1961 paper.

This is the same retrospective-relabel pattern the vault documents for
[[claim-werbos-1974-no-credit-assignment-language]] (absent entirely) and
[[myth-structural-credit-assignment-from-minsky-1961]] (a later qualifier bolted
on): a credit-assignment term reads as though native to a founding text but, on
primary inspection, is a later addition. Minsky *had* named the (temporal)
credit-assignment problem in 1961 ([[claim-minsky-1961-named-credit-assignment]]),
eight years before *Perceptrons*. The remaining gap — a standalone 1969 first-edition
scan for a direct diff — is routed to [[question-verify-perceptrons-1969-credit-assignment-absent]].