Summary
The 1974 collapse. The Lighthill Report (UK) and DARPA's disillusionment (US) cut funding after symbolic AI failed to deliver on machine translation and combinatorial planning. The winter was not a failure of ambition — it was a failure of the paradigm's ability to scale past toy problems.
Objectives
- 01Name the specific technical failures that triggered the 1974 cut.
- 02State the Lighthill Report's central objection.
- 03Distinguish funding collapse from research collapse.
The Lesson
The technical causes
Combinatorial explosion in search, brittleness of hand-coded rules, and the collapse of machine translation (Georgetown-IBM's 1954 demo did not scale). Perceptrons had been declared limited (Minsky & Papert, 1969).
The institutional cause
Lighthill's 1973 report to the UK Science Research Council concluded that AI had not delivered on its promises. DARPA reallocated funding. The community shrank; the ambition did not die.
Key Ideas
- Winters are funding events with technical causes.
- Combinatorial explosion is the recurring enemy of symbolic methods.
References
- Lighthill, 'Artificial Intelligence: A General Survey' (1973)