“Many people do this, so everyone should be allowed to do it.” The first part describes behaviour; the second recommends a rule. Whether the recommendation is good depends on more than the accuracy of the description.
The Stanford Encyclopedia of Philosophy discusses Hume’s famous observation about the move from “is” to “ought” in its account of his moral philosophy. Interpretations of the passage are debated, but it remains a useful prompt to inspect the premises that connect facts to evaluations.
Look for the missing bridge
Take an invented workplace argument: “This schedule increases output, therefore we ought to adopt it.” The factual claim may be relevant, but the conclusion also assumes something about the importance of output relative to other considerations, such as workload, fairness or service quality.
Making that assumption explicit does not automatically defeat the proposal. It makes the disagreement easier to locate. People may agree about the measured output and disagree about the value trade-off, or they may share the value and dispute the evidence.
The same check works in the other direction. A preferred moral conclusion does not establish that a factual prediction is true. A policy can have an admirable aim while relying on weak evidence about its effects.
Rewrite an argument in three lines
First state the descriptive claim. Next state the value or principle that gives it relevance. Finally state the proposed action. Label uncertain facts and contested values rather than hiding them inside a confident sentence.
For the schedule example, the middle line might say that a modest output gain justifies a change only if agreed protections for staff are met. That additional premise creates questions the team can actually examine.
This exercise is not a machine for solving every ethical dispute. It is a way to stop factual and evaluative disagreements from talking past each other. The argument becomes stronger when its bridge is visible enough for another person to question it fairly.