However, Niven soon found himself too busy with Lucifer's Hammer, on which he was already co-writing with Jerry Pournelle. Forward wrote the first draft himself, but several publishers suggested the story should be rewritten by Niven or Pournelle – who were still busy.
Niven soon became too engrossed in Lucifer's Hammer, a novel he was co-authoring with Jerry Pournelle. Forward wrote the initial draft himself, but several publishers recommended that it be revised by Niven or Pournelle – who were still working on their other collaborative project.