The importance of creative collaboration in Resnais's films has been noted by many commentators. Unlike many of his contemporaries, he always refused to write his own screenplays and attached great importance to the contribution of his chosen writer, whose status in the shared "authorship" of the film he fully acknowledged. He was also known to treat the completed screenplay with great fidelity, to the extent that some of his screenwriters remarked on how closely the finished film realised their intentions. (On the few occasions when he did participate in writing the script, particularly for his last three films, his contribution is acknowledged under the pseudonym Alex Reval, since he did not want his name to appear more than once in the credits.)