Perfect Imperfection: First third of progress (Polish: Perfekcyjna niedoskonałość. Pierwsza tercja progresu; also sometimes translated as "Ideal Imperfection") is a science fiction novel published in 2004 by the Polish science fiction writer Jacek Dukaj, ostentibly as the first part of a planned trilogy (no other parts have been published, nor announced as under development). It was published in Poland by Wydawnictwo Literackie. The novel received the prime Polish award for science-fiction literature, Janusz A. Zajdel Award, in 2004. It was translated to Russian in 2019.