L. Sprague de Camp, who knew Kuttner and Moore well, has stated that their collaboration was so seamless that, after a story was completed, it was often impossible for either Kuttner or Moore to recall who had written what. According to de Camp, it was typical for either partner to break off from a story in mid-paragraph or even mid-sentence, with the latest page of the manuscript still in the typewriter. The other spouse would routinely continue the story where the first had left off. They alternated in this manner as many times as necessary until the story was finished.