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Why is shared knowledge a dangerous assumption?
“Put the clean cups in the usual place before opening.”
To the person who has worked in the café for three years, this is a complete instruction. Clean means washed, dried and checked for lipstick marks. The usual place means handles facing right on the second shelf. Before opening means before the front door is unlocked, not before the first customer orders.
To a new worker, the same sentence contains three holes.
A Spark from The Vision
It is misleading to assume that a person knows the same as you about anything in life.
Words often carry more knowledge than they show. Experience supplies the missing steps so quickly that the experienced person forgets they were ever learned. The listener may stay silent because the instruction sounds simple, because asking feels embarrassing, or because they do not yet know which part they have misunderstood.
The gap then appears as a character judgment. The teacher thinks the learner was careless. The learner thinks the teacher set a trap. Both may believe the other person saw the same task.
Shared history can make the assumption stronger. Two colleagues may have worked together for years and still understand “send the final version” differently because one knows about a late change the other never saw. Familiarity creates real common ground, but it can also make people less likely to check where that ground ends.
Before assigning work, uncover three hidden parts of the sentence:
The starting point. What has this person done before, and what is genuinely new?
The local meaning. Which ordinary words have a special meaning here? “Finished,” “urgent” and “safe” can describe very different conditions in different rooms.
The proof. What would show that the task is understood? Asking “Do you understand?” mainly tests whether someone is willing to say no. Asking them to show the first step reveals more without turning the exchange into an exam.
Checking knowledge does not mean explaining everything to everyone. Too much explanation can waste time and speak down to someone who is ready. The answer is a short conversation, not a speech: “Have you done this version before?” “What would you check first?” “Which part should we look at together?”
The person receiving the instruction has a part too. Repeat the outcome in your own words. Ask about any word whose local meaning is unclear. Show an early piece before completing the whole task. These actions are not admissions of ignorance. They make hidden differences cheap to find.
Shared knowledge is dangerous to assume because its absence is invisible. Once the starting points are spoken aloud, the instruction becomes work two people can actually share.
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AI-generated from Innocent Mwatsikesimbe's writing.
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