Henning NØLKE : « The linguistic dilution of responsibilities. A polyphonic description of the evidential markers il semble que and il parait que » Assertion guarantees truth based on evidence available to the speaker. The speaker may indicate the source and type of his evidence. This paper deals with the two French evidentials il semble que and il paraît que. Both indicate hearsay evidence and are equivalent to the English evidential it seems that. Although very similar at first glance, closer analysis reveals important, though often rather subtle differences as to the type of evidence. A polyphonic study permits a detailed explication of their functioning, and may explain observable distributional differences.