Alan Turing — "Unless in communicating with it one says exactly what one means, trouble is boun…"
Unless in communicating with it one says exactly what one means, trouble is bound to result.
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More from Alan Turing
"The only real valuable thing is intuition."
"If a machine can pass the Turing Test, then it is intelligent."
"The popular view that scientists proceed inexorably from well-established fact to well-established fact, never being influenced by any unproved conjecture, is quite mistaken. Provided it is made clear…"
"The digital computers of today are in principle exactly the same as the universal machines I described."
"The more we learn about the brain, the more we realize that it is a very complex machine."
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Understanding this quote
What it means
Machines execute instructions with absolute literalness — they cannot infer intent, read between the lines, or tolerate vagueness. If you tell a computer something imprecise or incomplete, it will not compensate with common sense; it will simply do the wrong thing or fail entirely. Exact, unambiguous communication is the only language a machine understands. Precision is not optional — it is the entire basis of the relationship.
Relevance to Alan Turing
Turing built his entire career on this principle. His theoretical Turing Machine operated on strict formal rules with zero tolerance for ambiguity. At Bletchley Park, cracking Enigma required precise logical reasoning where any slip invalidated the result. His 1950 computing machinery paper grappled directly with what it means to instruct a machine unambiguously. He lived this truth daily — imprecision in his designs would have meant unbroken ciphers and lost lives.
The era
In the late 1940s and early 1950s, programmers wrote raw machine code with no compilers or high-level languages to absorb errors. A single misplaced instruction crashed an entire calculation. This also followed World War II, where precision in signals intelligence had been existential — Bletchley's codebreakers knew vague thinking cost lives. Computing was new, mystifying, and unforgiving, making Turing's warning both a technical truth and a cultural wake-up call.
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