Werbos's 1988 print account names his 1974 dissertation, not the TSP manual, as the first place the backpropagation-generalization results were documented

paul-werbostsp-manualbackpropagationhistory-of-mlpriority-vs-paternityhistoriography

Werbos's 1988 paper sequences three documentation events in what reads as chronological order: "The results were documented in Werbos (1974) [his Harvard PhD dissertation], embedded (and documented) in user-oriented software in an MIT version of the Time-Series Processor (Brode et al., 1975), and discussed in Werbos (1977)..." — naming the dissertation first, not the TSP manual. This sits in tension with his 1993 oral account's specific framing in claim-werbos-tsp-manual-first-publication, which names the manual — not the dissertation — as "the first publication of backpropagation... in a computer manual from MIT for a working command."

The tension may be more apparent than real. The 1988 passage concerns where the results were first written down (arguably the dissertation); the 1993 claim is specifically about the first publication of a working, usable command implementation (arguably the manual, since a dissertation is not "a command... for people to use"). Read charitably, the two accounts describe different axes of "first" rather than contradicting each other. But the vault's existing notes on this pairing (claim-werbos-1988-tsp-manual-citation-dated-1975, claim-werbos-tsp-manual-first-publication) had previously focused on the 1975-vs-1977 date dispute, not on which document Werbos himself names "first" and for what.

[unverified-mechanism — whether Werbos intended these two framings as compatible or was reframing his own history across the fourteen years between the two accounts is not established from the documents alone, and no further document read would settle it; this is an interpretive judgment about authorial intent, not a factual gap a primary source could close].