Assumptions. Putting a claim and reasons together often results in what Aristotle called an enthymeme, an argument that rests on an assumption the writer expects the audience to hold. These assumptions (which Toulmin calls warrants) that connect claim and reasons are often the hardest to detect in an argument, partly because they are often unstated, sometimes masking a weak link. As a result, it’s especially important to identify the assumptions in arguments you are analyzing. Once the assumption is identified, you can test it against evidence and your own experience before accepting it.