Foundation

One of two prequels to the Foundation Series and the last Foundation novel Asimov completed before his death.

The first book in Isaac Asimov's Foundation Trilogy and the third novel of The Foundation Series. Foundation is a collection of five short stories, originally published between 1942 and 1944, plus an introductory section written for the book in 1949, which were first published together as a book by Gnome Press in 1951. Together, they form a single plot. Foundation tells the story of a group of scientists who seek to preserve knowledge as the civilizations around them begin to regress.

The second book published in the Foundation Series, and the fourth in the in-universe chronology. It takes place in two halves, originally published as separate novellas.

Second Foundation is the third novel published of the Foundation series by Isaac Asimov, and the fifth in the in-universe chronology. It was first published in 1953 by Gnome Press, made up of two stories, originally published in 1948 and 1949.

The fourth book in the Foundation Series. It was written thirty years after the Foundation trilogy, in 1982, due to pressure by fans on Asimov to write another. It was his first novel to ever land on the New York Times best-seller list, after 262 books and 44 years of writing.
Foundation's Edge won the Hugo Award for Best Novel in 1983, and was nominated for the Nebula Award for Best Novel in 1982.

The fifth novel of the Foundation series and chronologically the last in the series. It was published in 1986, four years after the first sequel to the Foundation trilogy and its direct predecessor Foundation's Edge.