A fallacious argument where the evidence is drawn from some part of a whole but the conclusion is about the whole.
an erroneous conclusion that because something is true of each component of a phenomenon, it must be true of the entire phenomenon
The mistake of concluding that a property applies to the whole of something because it applies to each of its parts.
The erroneous view that what is good or true for the individual is necessarily good or true for the group.
A fallacy of composition arises when one infers that something is true of the whole from the fact that it is true of some (or even every) part of the whole. For example: "This fragment of metal cannot be broken with a hammer, therefore the machine of which it is a part cannot be broken with a hammer." This is clearly fallacious, because many machines can be broken into their constituent parts without any of those parts being so breakable.